I was wondering if it's ok to ground a wire ontop of an existing ground wire. So essentially two ground wires sharing one nut.

err.

 

As long as there is sufficient contact with the ground, there should be no problem at all. Just make sure you can get power using this ground DC power needs complete circuit: power and ground. this stands true as long as you are not trying to ground for something drawing 100+ amps. Hope this helps.

Lee

 

You can also be a little creative. Since our cars are based on a 12 volt negative ground system, almost any metal part of the car is a ground. You may find it easier to hook up if a metal part is closer to your wires.

DW

 

Not to jump on you, but this is not always true. There are parts of metal on cars that are isolated from the chassis, and this would not provide a ground. I am only saying this because it can be frustrating to hook everything up, only to find that you have an improper ground. Always test your ground before making putting everything back together. It is true, however, that most metal in a car can be used as a ground. Don't try to ground to a painted surface, it must be bare metal, the paint serves as an insulator.

Lee

 

Well, I did say almost, not absolutely every psrt Anyhow, I should have also mentioned the un-painted metal part as well.

DW