4 Prong Trailer Lights Wiring Diagram

4 Prong Trailer Lights Wiring Diagram. I've based it off this wiring setup where it runs up the center and. A four prong plug is for vehicles that have the left brake light double as the left turn signal (red turn signal) and the right brake like double as the right turn signal Just got done wiring up trailer lights.

Four Prong Trailer Wiring Diagram | Trailer Wiring Diagram (Ryan Chavez)

A split phase system is aptly named, because the transformers secondary is center tapped (or split). One switch is the outer lights, one for the inner. What is the fourth prong for?

Connect the white neutral wire to.

So this means your trailer wiring plug will need at least four contacts.

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I've based it off this wiring setup where it runs up the center and. I got a great kit from Uhaul and it was really straight forward. What is the fourth prong for?