Not sure if this has been posted yet; I searched and didn’t see anything.
My cargo light on the back of the cab never worked since I’ve had the truck. Finally got around to it today and found that it did have power at the connector and continuity through the light itself, so the issue was the ground. The light is grounded through the mounting bolts, but the connection from the bulbs to the bolts relies on metal molded to plastic in the light, which in my case was loose and rusted.
I cleaned up all the connections with fine grit sandpaper, grabbed some new bolts, and put it all back together. That got one bulb working but not the other.
From there I decided to just add a legitimate ground and be done with the issue. I added a jumper wire between the ground posts on each end of the light and added a pigtail wire with a ring terminal on the end to one post. Cut a bit of the rubber mounting gasket to clear the new ground wire and terminal, bolted the jumper to the cab and tucked the extra wire into the cab, and bolted the light back to the cab. With this setup the light now works perfectly.
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