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use a multi-meter to test the voltage on the female connector on the trailer.
If the reading is negative, switch the leads.
Positive reading = Positive lead is on the positive cable, negative lead goes to neg/ground.
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2016 Cougar 1/2 Ton Series 283 RETWE
2018 F150 EcoBoost FX4 Lariat Max-Tow and Heavy Duty Payload Package
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