![]() There is one ground wire running for the entire wiring harness. Choose a ground location that doesn’t contain any contamination, corrosion or paint. You will use a ring terminal and self-tapping screw for the connection. The ground wire needs to be connected to a bare, clean portion of the trailer frame. Figure out what parts need to be replaced and what can stay. ![]() If you are only replacing a few parts of the wiring and connectors, take an inventory before you get started. I recommend using a trailer lighting kit to ensure everything that you need is included. Gather Suppliesīefore you get started, you need to make sure you have all of the supplies. ![]() RELATED: How Much Does a Gooseneck Hitch Installation Cost? How to Install 4-Pin Trailer Wiring 1. Keep in mind that some cars may be wired in another way, so the best and correct way is to always measure the wiring with a multimeter. Here is a picture of how a 4-pin trailer should be wired. With the ground wire, you want to use a minimum of 16-gauge. The colors for a 4-pin trailer wiring diagram are:ġ8-gauge wire is the minimum recommended size for the 4-way plug. However, you should always check the installation manual before proceeding. While the codes might vary slightly between the manufacturers, most of them use the same generic options. ![]() How do you wire a 4-pin trailer connector to a 7-pin connector? 4-Way Trailing Wiring Color Codesīefore you get started on the installation, you must first understand what every color means. ![]()
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