Trailer Wiring 4 Wire To 5 Wire. If your trailer is significantly heavy and is at the upper limits of the towing Go to a trailer supply store and choose a wiring adapter that bridges the gap between your two connectors. Many times, trailer wiring is as easy as inserting the trailer plug into your vehicle's pre-rigged system.
Trailer wiring is very important to towing safety.
In fact, most vehicles, especially those meant for towing, come prewired and ready to roll.
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Adding botched trailer wiring to the mix makes troubleshooting harder. You can do this with documentation, or by testing with a multimeter. This is the easiest wiring you will ever have to do.