![]() Yellow Wire – left brake light and left turn signal.Green Wire – right brake light and right turn signal.These wires are all color coded with a different color or color combination to help you in matching each one with the correct pin.įor those with eight wires, there is usually an optional light blue wire that can be used for a third brake light if towing a camper shell, which can otherwise be ignored.īelow are the universal color codes for 7 pin trailer wiring for each type of trailer: Traditional SAE Trailer Wire Color Codes That said, the wiring harness in the majority of vehicles will contain eight different wires, and sometimes even more. There are seven different electrical wires that connect and sync the 7 pin trailer connector with your vehicle. While each trailer type is similar in terms of their different wiring connections, there are some slight differences as well. If you’re using a flatbed trailer to tow construction materials (think lumber, steel, heavy machinery), a dump trailer (stones, gravel, soil), or car hauler trailers to tow one or multiple vehicles, this is likely what you’re using. ![]() Heavy Duty – these are going to be your commercial or agricultural trailers, used for tougher jobs and to carry very heavy loads. RV Standard – if you’re pulling an RV, this is likely going to be what you’re using. If you’re pulling a boat, off-road vehicle, or hauling materials of some sort this will most likely be what you’re using to do so. Traditional SAE – this is going to be the most common trailer you’ll find and include utility trailers, equipment trailers, or cargo trailers. There are three main types of trailers, all with slightly different colored wiring and connectors.
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