Round 4 Prong Trailer Wiring Diagram

Round 4 Prong Trailer Wiring Diagram. This color trailer wiring diagram will help you when you need to connect your trailer to your truck's wiring harness or repair a wire that isn't working. This wiring harness can be configured to match any wiring pattern.

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This wiring harness can be configured to match any wiring pattern. The three prongs are for the two "hot" leads and the third is for the equipment grounding conductor. Two additional leads are accessable, Blue for connection to electric brakes and Black for aux power.

Connect the white neutral wire to the silver-colored (neutral) terminal on the outlet.

This wiring harness can be configured to match any wiring pattern.

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Now I can run the positive wire from the lights right to the aux fuse. Two additional leads are accessable, Blue for connection to electric brakes and Black for aux power. The old wire for the oven was left untouched and the electrician assured me it was ok to use.