7-ways are some of the most common harnesses found on trailers. 7-ways provide the required running lights, turn signals, brake lights, and ground for the trailer. In addition, they provide three additional pins for a 12V hot lead, electric brakes, and reverse lights. Trailer wiring can be one of the most intimidating components of your towing.. Let's get started: Step 1: Prepare for Vehicle Wiring InstallationIf your vehicle already has a 4-way connector, then great! Simply plug the trailer-end connector into the vehicle-end connector, and you're ready to roll.If your vehicle does not have a 4-way connector, it's usually pretty simple to add one.
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If you have a 4-way plug, add a 5-way with a 4-to-5-way adapter Use a circuit tester to confirm wire function. Step 2: Connect Ground to Vehicle Frame Just like we did on the trailer, we now have to connect the ground on the vehicle side. Attach the white ground wire to a clean, bare metal surface on the vehicle frame.. The 7 way plug wiring diagram typically includes pins for the following functions: ground, running lights, left turn/brake, right turn/brake, electric brakes, auxiliary, and backup lights. Each of these functions has a designated pin on the plug, which helps ensure that the correct connections are made.
