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Cellular forums Home > Archive > Garmin GPS > December 2007 > Nuvi 750 voltage
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| leafman60 2007-12-17, 10:33 am |
| Ok experts, I bought the new Nuvi 750. I want to wire in the car
adapter direct instead of using the cigarette adapter. I was planning
on cutting off the cig plug and wiring direct with a fuse. My
questions is this, what voltage goes from the cig adapter up the wire
to the GPS ?? Is it a full 12 VDC? or is it cut down to a lower level
etc ?? I cant get my volt meter to read any voltage when I plug up
the cig adapter and use the meter to check the connector that goes
into the Nuvi.
David
| |
| Howard Lester 2007-12-17, 10:33 am |
| "leafman60" wrote
> Ok experts, I bought the new Nuvi 750. I want to wire in the car
> adapter direct instead of using the cigarette adapter. I was planning
> on cutting off the cig plug and wiring direct with a fuse. My
> questions is this, what voltage goes from the cig adapter up the wire
> to the GPS ?? Is it a full 12 VDC? or is it cut down to a lower level
> etc ?? I cant get my volt meter to read any voltage when I plug up
> the cig adapter and use the meter to check the connector that goes
> into the Nuvi.
Rather than cut off the connector of a brand new adapter, get a power
adapter socket, and wire THAT to your car. Then you can plug in the
"cigarette adapter" directly into the socket and your worries are over. Not
only that, you still retain the adapter for use in other cars, if necessary,
as well as not risking voiding any warranty on the Nuvi.
| |
|
| leafman60 <leafman60@hotmail.com> wrote:
> Ok experts, I bought the new Nuvi 750. I want to wire in the car
> adapter direct instead of using the cigarette adapter. I was planning
> on cutting off the cig plug and wiring direct with a fuse. My
> questions is this, what voltage goes from the cig adapter up the wire
> to the GPS ?? Is it a full 12 VDC? or is it cut down to a lower level
> etc ?? I cant get my volt meter to read any voltage when I plug up
> the cig adapter and use the meter to check the connector that goes
> into the Nuvi.
>
> David
Did you make sure to set to DC instead of AC? Also, I may be dead old to
understand much about electric, but I am guessing that the AMPERE is what
does the killing not voltage. Or with 12 volt battery you may not get lot
more than 12 volts (may be up to 13-14 volts max, and 2 volts won't kill 12
volts device).
And if you worry about burning the Nuvi then I would suggest to add a FUSE
for protection (may be 10-15mA?). And you may wanna check the adapter as
most of them often list the voltage and ampere.
| |
| willshak 2007-12-17, 10:33 am |
| on 12/17/2007 9:41 AM Howard Lester said the following:
> "leafman60" wrote
>
>
>
> Rather than cut off the connector of a brand new adapter, get a power
> adapter socket, and wire THAT to your car. Then you can plug in the
> "cigarette adapter" directly into the socket and your worries are over. Not
> only that, you still retain the adapter for use in other cars, if necessary,
> as well as not risking voiding any warranty on the Nuvi.
There are dual sockets that plug into the single cigarette lighter
socket. No extra wiring necessary.
Here's one that looks like dual tailpipe extensions, but there are other
plainer ones.
http://www.partsamerica.com/Product...tegoryCode=3045
or: http://tinyurl.com/28gak6
--
Bill
In Hamptonburgh, NY
To email, remove the double zeroes after @
| |
|
| I am pretty sure no voltage changes take place withing the Garmin 12v cord,
but there is noise suppression I would bet. Automotive 12v systems are
pretty noisy, and most power cords have some type of filters in line. I
would worry about this more than voltage.
Wouldn't hurt to check to GPS plug with you DVM just to make sure about the
voltage thing.
John
"leafman60" <leafman60@hotmail.com> wrote in message
news:27901e78-fe49-47f9-91b9- 8ad72fe3c3f6@q77g200
0hsh.googlegroups.com...
> Ok experts, I bought the new Nuvi 750. I want to wire in the car
> adapter direct instead of using the cigarette adapter. I was planning
> on cutting off the cig plug and wiring direct with a fuse. My
> questions is this, what voltage goes from the cig adapter up the wire
> to the GPS ?? Is it a full 12 VDC? or is it cut down to a lower level
> etc ?? I cant get my volt meter to read any voltage when I plug up
> the cig adapter and use the meter to check the connector that goes
> into the Nuvi.
>
> David
| |
|
| "Howard Lester" <hlester@mmto.org> wrote:
> "leafman60" wrote
>
>
> Rather than cut off the connector of a brand new adapter, get a power
> adapter socket, and wire THAT to your car. Then you can plug in the
> "cigarette adapter" directly into the socket and your worries are over. Not
> only that, you still retain the adapter for use in other cars, if necessary,
> as well as not risking voiding any warranty on the Nuvi.
I haven't had any thought about doing so, but it seems a little more
complicate than what the OP plans to do. I don't own Nuvi 750, but from
what I understand about my Nuvi 680
The Cig Adapter has built-in MS Traffic Receiver as well as data storage.
And the other end has a special connector to the base (dock). And I haven't
seen third partyadapter available, not even Garmin site
| |
|
| willshak <willshak@00hvc.rr.com> wrote:
> on 12/17/2007 9:41 AM Howard Lester said the following:
>
> There are dual sockets that plug into the single cigarette lighter
> socket. No extra wiring necessary.
> Here's one that looks like dual tailpipe extensions, but there are other
> plainer ones.
> http://www.partsamerica.com/Product...tegoryCode=3045
> or: http://tinyurl.com/28gak6
If the OP wants to HIDE all the wires, I would suggest a different
extentions with WIRE so he can CUT and wire directly to the car. And
connect the original cig adapter to the extention.
| |
| Howard Lester 2007-12-17, 12:33 pm |
| "Joel" wrote
[color=darkred]
> I haven't had any thought about doing so, but it seems a little more
> complicate than what the OP plans to do.
No, it's not. To whatever he intends to attach the adapter's wires, he just
uses another length of wire, attaches a socket to it (presumably soldering
it), hides it under the dash somewhere, and then plugs in the Nuvi
"cigarette adapter plug." It's simple, it's clean, and he retains all the
original pieces intact.
| |
| keith 2007-12-17, 12:33 pm |
| On Mon, 17 Dec 2007 10:26:34 -0600, John wrote:
> I am pretty sure no voltage changes take place withing the Garmin 12v
> cord, but there is noise suppression I would bet. Automotive 12v
> systems are pretty noisy, and most power cords have some type of filters
> in line. I would worry about this more than voltage.
>
> Wouldn't hurt to check to GPS plug with you DVM just to make sure about
> the voltage thing.
>
> John
>
> "leafman60" <leafman60@hotmail.com> wrote in message
> news:27901e78-
fe49-47f9-91b9- 8ad72fe3c3f6@q77g200
0hsh.googlegroups.com...[color=darkred]
Haven't got a 750, but the fact that my 300 charges from the usb
connection makes me think that the input voltage is probably 5V. Most of
these adaptors designed for electronic circuits have a fair bit of
electronics in them, for stabilising and smoothing the outgoing supply.
Keith
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| leafman60 2007-12-18, 4:33 am |
| Guys, guys, ok. I appreciate the comments but I dont wanna keep the
cig lighter plug. Its too bulky. Im custom mounting on a motorcycle
and need to wire it in direct without a bird nest of wires stashed
somewhere. My only question is what voltage drives the unit itself.
Does the cig plug have a step-down resistor etc to cut the 12VDC
down ? Also, why cant I get a reading on my DC voltage scale when I
test the connector plug from the cig adapter?? Stange. The cig plug
seems very light and doesnt appear to have any components inside. The
weather and other data transmission is done with a different cord than
the basic car power adapter. I gues I could break the cig adapter
plug apart and look but I thought one of you gizmo fanatics would know
the answer to this.
By the way, the Nuvi 750 is great but the data has been streamlined
and street/road names etc are not as detailed as on the City Select
maps in my 276C.
What voltage ??????
On Dec 17, 7:52 am, leafman60 <leafma...@hotmail.com> wrote:
> Ok experts, I bought the new Nuvi 750. I want to wire in the car
> adapter direct instead of using the cigarette adapter. I was planning
> on cutting off the cig plug and wiring direct with a fuse. My
> questions is this, what voltage goes from the cig adapter up the wire
> to the GPS ?? Is it a full 12 VDC? or is it cut down to a lower level
> etc ?? I cant get my volt meter to read any voltage when I plug up
> the cig adapter and use the meter to check the connector that goes
> into the Nuvi.
>
> David
| |
| Christen Fihl 2007-12-18, 4:33 am |
| > Guys, guys, ok. I appreciate the comments but I dont wanna keep the
> cig lighter plug. Its too bulky. Im custom mounting on a motorcycle
> and need to wire it in direct without a bird nest of wires stashed
> somewhere. My only question is what voltage drives the unit itself.
> Does the cig plug have a step-down resistor etc to cut the 12VDC
> down ? Also, why cant I get a reading on my DC voltage scale when I
> test the connector plug from the cig adapter?? Stange. The cig plug
>
> What voltage ??????
I have replaced many Nüvi 660 (not 7xx) cables with FleetManagement
cables, and then opened some of the spare original cables.
The Traffic receiver is inside the cable as a cpu and a radio chip (in
that little block on the cable). The cigar plug has led lamps, that gets
controlled somewhere from Nüvi or Traffic receiver cpu. I do not think
you can measure anything normal, when not plugged into a Nüvi.
I guess Nüvi 750 is same layout as above.
The cables I use for FleetManagement is those specified here:
http://www.garmin.com/solutions/com...tedproducts.jsp
Picture: http://www.garmin.com/solutions/com...0-10865-00.html
Garmin have not yet updated for Nüvi 7xx, but I have use the same cable
directy in the 7xx, 760 I seem to remember.
BUT, This cable has no Traffic, and no special wirering in the cigarplug
(except it has a serial port instead ;-),
so this cable can be removed and you end up with 2 black and 2 red
cables, matching directly to 12V
Also, I would think (because it goes with my 660 too) that the plain
cable (https://buy.garmin.com/shop/shop.do?pID=1371) is easy to use for
same purpose, and less expensive to examine and cut.
Do remember that anything that goes into USB plug is always 5V.
--
Christen Fihl
http://www.innovative.dk/
| |
|
| "leafman60" <leafman60@hotmail.com> wrote in message
news:d92a3e21-3900-4fd3-8c0a- f9877b5be7bd@p1g2000
hsb.googlegroups.com...
> Guys, guys, ok. [snipped]
.. My only question is what voltage drives the unit itself.
> Does the cig plug have a step-down resistor etc to cut the 12VDC
> down ?
[snipped]
> What voltage ??????
>
>
[snipped]
Why don't you ask Garmin?
| |
| Jack Erbes 2007-12-18, 12:33 pm |
| leafman60 wrote:
> Guys, guys, ok. I appreciate the comments but I dont wanna keep the
> cig lighter plug. Its too bulky.
Is the part you have just a plug or is it a receiver?
> Im custom mounting on a motorcycle
> and need to wire it in direct without a bird nest of wires stashed
> somewhere. My only question is what voltage drives the unit itself.
<snip>
You have the unit. You have the cable. You have a VOM. I'd think that
would let you figure it out. Try this:
1 - Put the VOM in the R X 1 mode, short the leads, zero the meter.
2 - Put one lead on the center pin of the DC plug, then touch the
contacts on the nuvi connector until you find one where you get a very
close to 0 reading. If you can do that, you are straight through on the
12V source and have identified the 12V(+) contact on the nuvi connector.
3 - Put one lead on the side contacts on the DC plug and look for the
contact on the nuvi connector that will give you a close to zero
reading. You might find that more then one of them will do that, note
the one that is closest to zero.
4 - Put the VOM in the DC Volts mode, scale of more than 12V.
5 - Plug the DC plug into a power source and check the voltage across
the two pins identified in steps 2 and 3. If you have the input
voltage, then that is the voltage to the nuvi.
Life is a crap game, Garmin does not share a lot of technical info, and
obfuscates some of the info it shares. Sometimes you just have to study
the details and take your best guess.
The user's manual says the nuvi 750 input voltage is "vehicle voltage".
The optional accessory "Vehicle Power Cable 010-10747-03" for the 750
describes itself as a "12-volt adapter cable".
If that is the cable you have and the test shows that it passes the
input voltage to the GPS connector, you can cut the end off and wire it
in. Fusing it is a good idea because the contacts on the connector will
be hot and exposed when not connected to the nuvi.
> Does the cig plug have a step-down resistor etc to cut the 12VDC
> down ? Also, why cant I get a reading on my DC voltage scale when I
> test the connector plug from the cig adapter?? Stange.
<snip>
The Quest uses a DC-DC inverter housed in the Unit Bracket to drop the
input voltage to 5V. Most of the others will take wider range of
voltages (like 9 to 35V or 12 to 24V) and regulate the voltage internally.
Is the meter working? Is the fuse good? Are you sure you are touching
the contacts on the nuvi connector? Sometimes you have to use a needle
tip probe to get at those. Test the fuse on the DC plug, then test the
meter with a battery or other power source.
All the other Garmins I have ever had or messed with will take a 9-35V
or will take a 12V or 24V input. In reality, many of them will work on
any voltage from 9V to 35V (or more?).
It will be interesting to see how well the 750 does on a motorcycle,
they are not waterproof and I'm not sure they are rugged enough either.
I use my 76Cx and a 2610 on my bike (Dyna FXD) and they are doing
fine. I'll consider a zumo when/if the 2610 ever gives up the ghost.
Jack
--
Jack Erbes in Ellsworth, Maine, USA (jackerbes at roadrunner dot com)
(also receiving email at jacker at midmaine dot com)
| |
| James Robinson 2007-12-18, 3:33 pm |
| Jack Erbes <jacker@midmaine.com> wrote:
>
> leafman60 wrote:
> <snip>
>
> The Quest uses a DC-DC inverter housed in the Unit Bracket to drop the
> input voltage to 5V. Most of the others will take wider range of
> voltages (like 9 to 35V or 12 to 24V) and regulate the voltage
> internally.
>
> All the other Garmins I have ever had or messed with will take a 9-35V
> or will take a 12V or 24V input. In reality, many of them will work
> on any voltage from 9V to 35V (or more?).
The cigarette lighter adaptor for my NUVI will accept 10 to 30 VDC input,
and outputs 5VDC at up to one amp to the USB connector. Thus, there will
be more than just a step-down resistor in the connector. It will have a
voltage regulation circuit.
| |
| Marcel Aerts 2007-12-18, 3:33 pm |
|
"leafman60" <leafman60@hotmail.com> wrote in message
news:27901e78-fe49-47f9-91b9- 8ad72fe3c3f6@q77g200
0hsh.googlegroups.com...
> Ok experts, I bought the new Nuvi 750. I want to wire in the car
> adapter direct instead of using the cigarette adapter. I was planning
> on cutting off the cig plug and wiring direct with a fuse. My
> questions is this, what voltage goes from the cig adapter up the wire
> to the GPS ?? Is it a full 12 VDC? or is it cut down to a lower level
> etc ?? I cant get my volt meter to read any voltage when I plug up
> the cig adapter and use the meter to check the connector that goes
> into the Nuvi.
>
> David
Is this helpfull??
http://pinouts.ru/GPS/ garmin_nuvi_...r />
nout.shtml
| |
| Jack Erbes 2007-12-18, 3:33 pm |
| James Robinson wrote:
<snip>
> The cigarette lighter adaptor for my NUVI will accept 10 to 30 VDC input,
> and outputs 5VDC at up to one amp to the USB connector. Thus, there will
> be more than just a step-down resistor in the connector. It will have a
> voltage regulation circuit.
But can you use that nuvi for navigation when you power it via the
mini-USB connector? Some of the nuvis go into the "connected to a PC"
mode (I forget the real name for it) when power is applied to the
mini-USB connector and cannot be used for navigation in that mode.
Or does the nuvi draw power from the mini-USB and remain usable as a GPS
receiver when there is no PC on the other end of the cable?
The OP was asking about the voltage on the other connector.
Jack
--
Jack Erbes in Ellsworth, Maine, USA (jackerbes at roadrunner dot com)
(also receiving email at jacker at midmaine dot com)
| |
| James Robinson 2007-12-18, 3:33 pm |
| Jack Erbes <jacker@midmaine.com> wrote:
>
> James Robinson wrote:
>
> But can you use that nuvi for navigation when you power it via the
> mini-USB connector? Some of the nuvis go into the "connected to a PC"
> mode (I forget the real name for it) when power is applied to the
> mini-USB connector and cannot be used for navigation in that mode.
>
> Or does the nuvi draw power from the mini-USB and remain usable as a
> GPS receiver when there is no PC on the other end of the cable?
If I use my Motorola cell phone charger, either the AC or car version, it
will charge the battery, but the NUVI will go to "connected to PC" mode.
If I use the Garmin charger, the NUVI beeps and the display goes to full
brightness. It continues as a navigation system without interruption.
Thus there is a subtle difference in how the mini-USB plugs are wired,
perhaps in how some of the pins are grounded.
I can temporarily adjust the display brightness down while on the
charger. When the charger is disconnected it will beep and revert to the
brightness setting I previously stored, plus it will start a 30 second
timer that will shut it down unless I override.
| |
| Jack Erbes 2007-12-18, 10:33 pm |
| James Robinson wrote:
<snip>
> If I use my Motorola cell phone charger, either the AC or car version, it
> will charge the battery, but the NUVI will go to "connected to PC" mode.
>
> If I use the Garmin charger, the NUVI beeps and the display goes to full
> brightness. It continues as a navigation system without interruption.
> Thus there is a subtle difference in how the mini-USB plugs are wired,
> perhaps in how some of the pins are grounded.
>
> I can temporarily adjust the display brightness down while on the
> charger. When the charger is disconnected it will beep and revert to the
> brightness setting I previously stored, plus it will start a 30 second
> timer that will shut it down unless I override.
Thanks for the interesting details.
I'd guess that the Garmin mini-USB cable uses a resistor of a specific
value to give that cable a "personality" that sends a signal to the nuvi
and trigger the normal behavior. That is described in this link at
Marcel posted:
http://pinouts.ru/GPS/ garmin_nuvi_...r />
nout.shtml
Jack
--
Jack Erbes in Ellsworth, Maine, USA (jackerbes at roadrunner dot com)
(also receiving email at jacker at midmaine dot com)
| |
| leafman60 2007-12-18, 10:33 pm |
| Hey thank all of you for the help. Ill keep working on it. I do know
how to use a VOM, lol. The contacts on the wire from the cig plug are
obvious. The puzzling thing to me is that with the Nuvi 750
diconnected from the wire assembly, apparent there is no voltage
pass. Ill get into it this weekend for sure and figure it out.
Try asking Garmin a question like this ! lol They give NO information
this specific and the "techs" only say these units are designed to be
used with 12 VDC vehicles WITH the included accessory connectors.
They dont want you monkeying around with their stuff and doing things
like cutting up their wires.
Im using the 750 on a BMW R1200S sportbike because of the Nuvi's thin
size and ease of mounting in a tight situation. The other units
designed for such applications ( Zumo, 276, 376) are huge clunkers
that dont fit as well in my application. Gosh, that Zumo is especially
a fat hog and weighs about 5 pounds.
The Nuvi seems to be working fine. During any rain, Ill just remove
it from its velcro perch and slip it in a dry place. I also taped up
the SD card slot and earphone jack hole to seal against dust etc.
The touch screen seems to actually work better than the button models
like my 276c. Spelling out an address etc by scrolling through the
alphabet for each letter and then entering it one letter at a time is
so stupid. The 750 has a keyboard screen that you just type out the
input.
I have noticed, however, that the data in the Nuvi is not a detailed
as the maps I use with my 276 (City Select). Names of small streets
and trails are omitted. At least I dont have to download maps,
however.
On Dec 17, 7:52 am, leafman60 <leafma...@hotmail.com> wrote:
> Ok experts, I bought the new Nuvi 750. I want to wire in the car
> adapter direct instead of using the cigarette adapter. I was planning
> on cutting off the cig plug and wiring direct with a fuse. My
> questions is this, what voltage goes from the cig adapter up the wire
> to the GPS ?? Is it a full 12 VDC? or is it cut down to a lower level
> etc ?? I cant get my volt meter to read any voltage when I plug up
> the cig adapter and use the meter to check the connector that goes
> into the Nuvi.
>
> David
| |
| Jack Erbes 2007-12-19, 10:33 am |
| leafman60 wrote:
> Hey thank all of you for the help. Ill keep working on it. I do know
> how to use a VOM, lol. The contacts on the wire from the cig plug are
> obvious. The puzzling thing to me is that with the Nuvi 750
> diconnected from the wire assembly, apparent there is no voltage
> pass. Ill get into it this weekend for sure and figure it out.
I don't know how they could manage to make the voltage disappear if you
have the standard auto power cable, not a receiver. It will be
interesting to see what you figure out.
> Im using the 750 on a BMW R1200S sportbike because of the Nuvi's thin
> size and ease of mounting in a tight situation. The other units
> designed for such applications ( Zumo, 276, 376) are huge clunkers
> that dont fit as well in my application. Gosh, that Zumo is especially
> a fat hog and weighs about 5 pounds.
The zumo is about 11 ounces and the nuvi 750 a little over 6 ounces.
That does not include the mount or anything, just the receiver. But if
the extra five ounces accounts for the extra ruggedness and
waterproofing, I'll accept it.
I would buy and use the zumo without any of the brain candy inputs and
extra antennas and receivers. I wouldn't use that stuff if I had it.
If I was going to buy a zumo today it would be the 450.
A big difference to me is that the zumo would come with City Navigator
North America for a PC install for planning and post trip review of
tracks and stuff.
And when you get to "tracks and stuff" the nuvi is a empty wasteland
when you compare it to the zumo. The zumo will do multiple destination
routing, accept uploaded routes from MapSource, display tracks and store
track data for days, weeks, or months on end.
Having gotten used to using all the bells and whistles that came in
older units like the StreetPilot 2610, I just can't bring myself to give
most or all of that up. The 2610 is starting to look a little long in
the tooth in comparison to some of the newer units, and it *is* a little
bulky and heavy for the use you you describe. But once it is solidly
ensconced in its RAM mount it is trouble free and does fine.
<snip>
> I have noticed, however, that the data in the Nuvi is not a detailed
> as the maps I use with my 276 (City Select). Names of small streets
> and trails are omitted. At least I dont have to download maps,
> however.
Is there a detail level setting, that may also relate to the zoom level,
that controls the amount of detail about street names and the like?
Jack
--
Jack Erbes in Ellsworth, Maine, USA - jackerbes at adelphia dot net
(also receiving email at jacker at midmaine.com)
| |
| leafman60 2007-12-27, 10:33 pm |
| Yes, there is a detail selection but I have that set to highest detail
and its still not as much info as I could pull up on my 276. Another
thing that bugs me is that when you zoom out enough to see about 10
miles around you, many of the small roads disappear. Thats always
been a big hangup with GPS. Unlike an old paper map, sometimes its
hard to get a wider perspective on where you are.
I do like the small size of the Nuvi and I also like the operating
system. Its very logical. I especially like the touch screen and the
type-in keypad screen for entering data. Its much better than the
stupid scroll and punch buttons of the 276.
By the way, I havent gotten back to testing the operating voltage on
the Nuvi yet.
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