Wiring Diagram 4 Wire Trailer Round. This is a short video series of the steps that I have taken to refurbish and old Utility Trailer that was designed and built by my father. The first step in wiring your trailer cables is to ground the white cable first.
As long as you concern yourself with only one circuit at a time, this job will not require you to read those schematic diagrams that have tiny. Your trailer wiring plug doesn't match the one on your vehicle. Interactive & comprehensive electrical wiring diagram for DIY camper van conversion.
Trailer wiring can be difficult to get your head around.
So here I have an older trailer which needed some work, along with re-wiring the lights.
Video tutorial on how to wire trailer lights. Some of the lights were out, but the light bulbs were fine. The first step in wiring your trailer cables is to ground the white cable first.