3 Wire Trailer Light Diagram. Never put your trailer on the road with questionable wiring or a lighting system that is already known. To make this tutorial easier to understand, I I have already removed what was left of the old wiring and will be installing everything new except lights.
The following trailer wiring diagram(s) and explanations are a cross between an electrical schematic and wiring on a trailer.
Trailers that use this are usually fairly light weight and don't have brakes or other power accessories.
It's a green light that should flash once every time you put your signal light on (either direction). Wiring your Miata for Trailer Lights. Trailer Wiring Diagram - Wiring Diagrams For Trailers By law, trailer lighting must be connected into the tow vehicle's wiring system to provide trailer running lights, turn signals and brake lights.