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My project this afternoon was too ground the cab lights. When I pulled the liner down, it seems that may already be done. Each light has only one wire coming through the roof. Each of those are wired together and appears to run down the A pillar. Before I took the dash apart to trace down the "ground" wire, I wanted to check with y'all.
The blue wire is the power/hot wire. The ground is between the light base and the cab. Uses a mount screw to ground to the cab. This isn't a good way to ground these lights. I run the ground wires inside the cab, spliced them all together, and run the ground wire to a known good ground source. Now all my lights work with no problems.
I soldered 12" of wire to the ground wire on the light, heat shrink that connection, then shoved the wire down the same hole as the power wire. Then I used a longer wire, about 4' long, and soldered all the ground wires to that. Crimped an eye connection on the end and screwed it to a known good ground.
Are you blowing fuses when the lights are turned on? I don't see where the lights are getting power....it seems that the blue (hot) wire is moused (the pinch connections) directly to ground (the black wire)
You should have two wires from each light. One is hot - in series - (blue) going to the loads (bulbs), through the load and then to ground. The individual ground wires seem ok for their connections, but you don't have power to the load itself. I have never seen power transmitted to cab lights through the cab metal itself......fix the power supply to the loads and you'll have lights.
Ok slik, I think that's my problem. There is only one wire on the light assembly. The metal housing the bulb clicks into also goes around the front screw. I'm assuming that is the ground, since there is no other wire. I need to buy new assemblies anyway because mine are dry rotted. I broke the second one i tried to remove while invetigating this conundrum. Will the new ones come with two wires or will I have the same issue?
I am not blowing fuses, just some lights don't turn on unless I jiggle them.
......Those don't look like my factory lights, and, while that looks like it works quite well, those pinch nuts aren't really right for the application. Mine has nut-serts through the roof, and machine screws, and they've never had a grounding problem. I'd bet if you clean the inside up to metal, then used a machine screw/nut, you'd be okay. Or even just a ring terminal on the screw inside the housing then out through the wiring hole, you'd be good to go if you don't want to solder.
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