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From : redhornet

Q: thanks for the link scott. i had actually looked at that site earlier. unless i am missing something i dont think it said definitely for dodge trucks whether or not is backup. i went back and looked again am i missing something -lint scott hendryx wrote hello ive been reading about 7-pin trailer wiring and that is an auxiliary pin on them and that it is now often used for backup lights. does any know on a 2003 dodge ram 2500 if that is indeed for backup lights -lint http//www.marksrv.com/wiring.htm here ya go. .