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No trailer running lights on 07 5.9, also truck is losing prime at under 1/2 a tank

Liviniuk

By Liviniuk
in 3rd Generation Dodge

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Liviniuk

Liviniuk

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So here's the issue. I have power to my 7 pin on the truck, but when I plug rv into truck, no running lights. Have brake hazards and signals. I used a test light and confirmed I have power to the 7 pin. Any ideas? Trailer wiring is good. Tested it on my 01 cummins and all lights work. Also, truck seems to be losing prime at under half a tank, lift pump or check valve? Any suggestions would be great!!

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