I was hoping to get a little advice on testing some electrical pieces on my suburban. Its a 3/4 ton 350TBI TH400 ect... Basically 2 problems. #1 Running lights drivers side rear are not functioning. Brake lights turning signals work, just no running lights on the drivers side rear only. I did a little bit of research on this, and my reading points to a faulty light socket. I have a volt meter, was hoping there is a way I could test this before I order a new socket. I have tried the bulb from the passenger side which is working, no change. #2 Fuel gauge is crazy. It works sometimes, most of the time it doesn't. I suspect ground due to wacky nature and the fact that it does work. I suspect this is the ground wire or gauges, waiting for it warm up outside before I go test. Just looking for a little advice to see if I am heading in the right direction.