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wiring trailer lights wont work when hooked up to truck [duplicate]

trailer lights rewired and work directly off a battery. PU truck trailer light housing works with test light...When I hook up housing to trailer , trailer lights don't work... all grounds ok help
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330 views

Trailer wiring corrosion

Every couple of years I find that the trailer wiring connector (7 pin) on the back of my truck doesn't work properly, causing the brake or turn signals on the trailer to not function. This is caused ...