Matthew,Underhood likes work!
MrsKenmore did a great job figuring out how these mercury lamp sockets worked. It's very simple but brilliant. Power comes off the 12V+ constant at the bulkhead connector terminal that feeds the rear tailgate glass and trailer. I had the lights installed upside down first. Nope. Even though the light would illuminate the engine better, this doesn't work.
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Much better now.
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I'm using 1141 bulbs now but I am thinking some LEDs would be very handy to have as to not drain the battery.
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I'm trying to find nice grommets. The ones from back in the day were so much better. The new ones are really just plastic and the hole here is 15/16". I have 7/8" and 1" plastic grommets from Auveco. Neither work. I wish the old style rubber ones were available. I have yet to find them.
Here is the lamp socket in pieces.
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