Question about Garmin Nuvi 780 4.4 in. Car GPS Receiver

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Hello. I have a problem that no one has seemed to be able to help me with. All i get is a dumbfounded look or scratch on the head. I have a Garmin Nuvi 780 GPS for the car. I do not have a cigarette lighter in the vehicle to power the GPS when the battery dies in it. This GPS does not have a user replacable battery for it. Yes i know i can buy one and unscrew and pry the GPS open and replace it but i dont want to do that every time the battery dies. What i am looking for is a portable power supply i can take in my vehicle that has a receptacle that i can plug the car charger made for my GPS into to. I tried the Gomadic rechargable battery pack and it was a joke. Will be sending that back. All i want to do is to be able to navigate while my GPS is plugged up to something to get power to it. Can anyone tell whay i need and where i can get it. I would very much appreciate it. JoAnn

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Hi JoAnn, What you really need is a cigarette lighter socket in your car and this doesn't have to be a big problem. In most car accessory shops you can get cigarette lighter socket splitters, like the one at

Now I know these are supposed to plug into your cigarette lighter socket but you can remove the plug from the end of it and get wired directly to the fuse board of your car. The wire that goes to the centre tip of the plug connects to the positive/fuse of the fuse board and the wire that's connected to the outer part of the plug connects directly to an unpainted metal part of the car. You can do this by loosening a bolt, wrapping the wire around it and tightening it again. The block with the sockets on it can be either glued with double sided tape to a convenient part of your car interior or left loose if you prefer.

If you're not happy wiring it directly yourself it should not cost a lot to get done in a garage. If I was in your position that's what I'd do.

Posted on Mar 29, 2011


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