Red (or Black) = 12V Auxiliary Power (See Red Wire Notes below.)ħ. (6-Pin Connectors also exist, but they are less common.)ġ-4 Wire the first 4 pins just like above, and the 5th line goes to the brakes.Ħ. The 2 added pins are typically for Auxiliary Power and Back-up Lights.Įxpanded Use Trailer + with Brakes, Aux Power & Back-up Lights = 7-Pin Connector.
It’s OK, within the standards, to leave out wires for your custom situation.Īlso, worth noting, When Does My Trailer Need Brakes?įor trailers that have a little more going on electrically, we recommend 7-pin connectors. The 5-Pin flat connector above is nice for easy handling, but if your vehicle already has a 7-pin, just use it.
It accomplishes the same thing for 5 wires, but with a connector that’s compatible with your truck. Use the 7-pin connector anyway (see below), and just leave out the last 2 wires. If your truck has a built-in 7-pin socket, but you only need 5 of the pins. In the Trailer Wiring Diagram and Connector Application Chart below, use the first 5 pins, and ignore the rest. Blue = Electric Brakes or Hydraulic Reverse Disable (See Blue Wire Notes below.) Traditional Trailer + with Brakes = Use a 5-Pin Connector.ġ-4 Wire the first 4 pins (White, Brown, Yellow, Green) just like the 4-pin connector above.ĥ. The 5th pin, a blue wire, gives power to operate (or disable) the trailer brakes. If a trailer has brakes, then it needs a connector with at least 5 pins. That’s not mandatory everywhere, but it’s a good idea. Trailers with capacity over 3000# Total Gross Trailer Weight should have brakes. (Round style 5-Pin Connectors also exist.) The 4-Pin connector only has the first 4 items listed. Please see the Trailer Wiring Diagram and Connector Application Chart below. Green = Right Turn Signal & Right Brake Light Yellow = Left Turn Signal & Left Brake LightĤ. Brown = Tail Lights, Side Markers and Running Lights (See Brown Wire Notes below.)ģ. White = Ground (See White Wire Notes below.)Ģ. Lighter Duty Trailer (No Brakes) = Use a 4-Pin Connector.ġ. Small utility trailers, light boat trailers, little campers, off-road trailers and many more use this traditional 4-Pin Flat connector. It’s the most common style for “consumer” type trailers. Trailers that use this are usually fairly light weight and don’t have brakes or other power accessories. The most common 4 wire connector is the 4-Pin Flat Connector as shown here. 4 wires will give these functions, so the simplest scheme is a 4-pin connector. It can get confusing, so if you don’t already have a specific standard in mind, follow these.Īt a minimum, all trailers need at least 4 functions: Tail lights, Brake lights, Left & Right signals. That said, for specific situations, there are industrial standards with different connectors and wire arrangements. We recommend these standards because they are pretty universal. The following trailer wiring diagram(s) and explanations are a cross between an electrical schematic and wiring on a trailer. Some brakes need electricity too - to actuate electric brakes, or to disable hydraulic brakes when backing up. Some also need side markers and running lights. To start, every trailer needs lights - brake lights, turn signals, and tail lights.
The approach for you depends on your electrical needs. Follow these guidelines and make it right! Each standard has it’s different purpose, so please don’t just make it up as you go. There are several standards for trailer wires, and if you search, you’ll find a different Trailer Wiring Diagram for each. And, a little more information to make sure I get it right! Yikes! Where do I start? I need a trailer wiring diagram. And, so many kinds of trailer wiring connectors.
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