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Web 10 methods how to test a 7 pin trailer plug 1. Amazon's choice rampro rv trailer plug light. Led lights indicate which functions (brake, turn, tail, stop, reverse, electric brakes, and 12v) are properly working.
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Web the 7 flat (spade) pin trailer circuit tester tests tow circuit lights. Web 10 methods how to test a 7 pin trailer plug 1.
