I hate wiring but did my best to follow the diagram and look for any wires that may have been missed placed. I havn't been able to find anything out of the ordinary...where should I turn next? Sorry for the lack of knowledge but I don't know if they've ever worked sinced I bought the truck. The truck has been sitting in a shop for a couple of years and I never really drove it. Now i'm ready to get the tags updated but can't get the inspection til I figure out why my rear running lights aren't working. Also noticed my license plate light doesn't work. Every thing else works fine...head lights, high and low, front and side blinkers/side markers, rear left and right blinkers/ and brakes...What's causing this one little problem??? Joe

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1980 dodge custom 150, 225 slanter, four on the floor, restoring lil by lil. So far the engine has the clifford intake and headers, holley 390cfm vacuum secondary, all stock from there.

I would check for 12 volts at the back of the harness of the lights. Use a sharp test lead to "pierce" the insulation and see if you get your 12 volts. If you do you have a problem in the tail light assy. (maybe the bulb sockets) Another thought is the wrong bulb (happen alot).
If no voltage then trace forward as far a you can and repeat the process.
NOTE you must have your parking light switch on for your test.
My02.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

Well was shocked to find they just started working last night. I went through all the connections and made sure they were all still tight. I'm thinking I have a loose connection some where but in the mean time it will do. Thanks for the replys

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1980 dodge custom 150, 225 slanter, four on the floor, restoring lil by lil. So far the engine has the clifford intake and headers, holley 390cfm vacuum secondary, all stock from there.