Question about 2007 Ford F-350 Super Duty XLT

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Trailer signal lights don't work or break lights. trailer breaks work fine ??????????

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Is there voltage at the truck connector? If not, check the fuse. If the fuse is OK, then check the condition of the wiring. I see trucks all the time on the road with dangling wiring harnesses, and it is very common for the wiring to get damaged. Good luck.

Posted on Aug 23, 2010

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i would use a multimeter to read each wires operation voltage before hooking up. ex. turn on turn signal, connect meter to find which wires is pulsing.

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check all trailer tow fuses in panel under hood.there is a fuse for trailer brake lights and a fuse for trailer signals.but if one signal is working it is probaly broken or corroded wires at the back of the trailer plug or corroded wires inside plug.

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