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Use only the needed wires, and ignore the others.You may be a technician that wishes to look for references or solve existing problems. If the trailer axles do not have brakes, then no need for a blue wire. Extrapolate the same expansion for additional axles. Only the blue brake and white ground wires are different. The image above shows a single axle trailer, and the next image shows wiring for Tandem Axles. These 2 wire diagrams fit the needs for most trailers. It is OK to leave a pin or two blank unused and unconnected. Several industrial styles are similar and definately use different pins. Other styles exist - though the pin-outs are often different. The 5-Pin flat connector above is nice for easy handling, but if your vehicle already has a 7-pin, just use it.įor trailers that have a little more going on electrically, we recommend 7-pin connectors. Use the 7-pin connector anyway see belowand 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. 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. Trailers with capacity over Total Gross Trailer Weight should have brakes. The 4-Pin connector only has the first 4 items listed. The most common 4 wire connector is the 4-Pin Flat Connector as shown here. 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. Brakes probably need electricity too - to actuate electric brakes, or to disable hydraulic brakes when backing up.
Some also have side markers and running lights. To start, every trailer needs lights - brake lights, turn signals, and tail lights.
And, a little more information to make sure I get it right! Follow these guidelines and make it right! The approach for you depends on your electrical needs. Where do I start? I need a trailer wiring diagram. And, so many kinds of trailer wiring connectors.
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