Originally Posted by chetos
Its the light in the hood directly over the door. I took the switch out to trouble shoot it so it's not a varible. It was corroded up so that was the first problem. I also cut out the socket, which was corroded up too, so that was the second problem. These things come in three! this last one is confusing. I can't tell where the ground wire goes so I'm not sure what is going on there.
Some of the over the door lights had 12 volts going to them, and used a two contact bulb, with the second wire being run to the switch which was then grounded. So, the switch was in the ground line, not the hot line. A couple of the 60's AS that I had used that system. Yours could also be one of them.
If there are two wires from the socket and there is always 12 volts to ground at one of them, you probably have that "switch in the ground line" system.
That switch in ground line system was also common on cars where the door switch for the dome light actually completed the ground circuit. That way either front door (or rear door) could operate the light by grounding it and the +12 volts only had to go to the light itself, not to all the switches.
All the recent AS products I have had used the switch in the + line, like you would expect, but not the older ones.