I found some under dash courtesy lights from a Buick on Ebay and wired them into the dome light harness. I got one complete rear courtesy light harness and another that had been cut from members here. That's what I used to plug in at the dome light and run back to the rear courtesy lights. It's just two wires. The pink hot wire and the white ground. The ground wire is run rather than grounded to the body because that's how the lights are switched. With a ground switch. It's a tad late for a how to on the courtesy lights, as they are installed and the wiring covered by the headliner, but I could do one on the trunk light.
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