Hey fella's, Having some light problems with the stock 7 pin harness/4 pin adapter combo on a small camper. Brake and turn signal lights work but not the day time running lights. However same trailer and 4 pin adapter hooked up to the brother in laws truck, everything works fine. I hooked up to some of the trailers at my work and the same problem happens. Could some one with more know how, confirm with me that my trucks wiring is bad? pretty sure it is but I'd like some more in site.
Sorry if this is a re-post