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So I tore everything down to install the map light mirror assy. Unfortunately there is no plug convienently located next to the mirror mount. I took most the headliner down in search of the plug, but it just wasn't there. So I traced the wires running up the driver A pillar up to the dome light. There are 4 wires running up the A pillar; green, cream, black and black w/ a white line. The two black wires run to the dome light and the green and cream go back to the brake light on the rear of the cab. So I needed to figure out which black wire had constant power to it and which was the door trigered wire. I was anticipating both being positive and the door trigger as the switch for the positive to the dome light in door mode. Turns out the solid black wire is constant positive power while the black wire with a white line is actually a ground trigered by the door switch (door opens it connects the ground, door closes it opens the ground and the dome light goes out). So I spliced into the solid black wire and ran a wire to the map light mirror assy. Unfortunately my map light wasn't sent with the attaching clip that plugs into it or the 4 bolts. You can reuse the two fine threaded bolts from mirror assy that doesn't have the map lights but you still need the course threaded bolts. So I will call the salvage yard and see if they can send the 4 bolts and if they are willing to cut the wire harness to give me the clip. I'll post pics later.
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