The black wire will be the power wire and the white wire is the ground wire. Wiring marker lights to either your vehicle or trailer is not complicated and can be performed with a minimum of tools and expertise.
Wiring Diagram Type 924 S Model 87 Sheet Porsche 944 Electrics
Side marker light wiring diagram. One clearance light on each side and then one larger one at the back. How to rewire a trailer with led lights. With wiring diagram included. Brakes probably need electricity too to actuate electric brakes or to disable hydraulic brakes when backing up. The yellow and green wires are for the left and right turn signals. These too would run off the brown or parking light wiring same as the license plate light.
And the third diagram using clearance lights. When installing a sidemarker light such as this optronics trailer light mcl44ab you will want to splice into the signal wire for your trailer running lights circuit and then run the ground wire to a clean metal surface. Check with your state rules but most states require red marker lights on both tail lights and amber marker lights mounted near the front of the vehicle. If this is a new wiring installation and you are installing wiring like part a35w42b the brown wire that runs down each side of the trailer is for the marker lights and tail lights. Some also have side markers and running lights. You will want to tap into the brown wire for the marker lights.
Marker lights must be visible from each side of the vehicle. The license plate light would run off the parking lights known as the brown wire so you can pull the power supply from either side. The following trailer wiring diagrams and explanations are a cross between an electrical schematic and wiring on a trailer.
Gallery of Side Marker Light Wiring Diagram
