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04-24-2019, 12:23 PM #21
With a surge brake trailer, the vehicle should not effect the brakes moving forward, but if the issue is backing up, just need to test to for voltage on the revers pin when truck is in reverse. I would check the owners manual fuse box layout for a possible dedicated reverse fuse for trailer harness. Most trucks have park and stop/turn signal fuses for the trailer harness, so to not blow the trucks lights fuses if there is a trailer issue.