No power to turn signal and brake relays

Asked by Oct 08, 2017 at 01:16 PM about the 2003 Ford F-350 Super Duty XL LB 4WD

Question type: Maintenance & Repair

I have an 03 Ford F3 50 I have turn signal and
brake on truck all fuses are good all relays are
working I just don't have turn signal and brake at
the trailer harness all wires are good ground is
good. If I take the left and right turn signal relay
under the hood out and use a jumper wire I get the
trailer turn signal and brake to work what is my
problem

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