How to Wire a 7-Pin Trailer Plug
Seven-pin trailer connectors are used on recreational vehicles and trailers. Over time, these connectors can become corroded and cause wiring problems, or become physically damaged, requiring a replacement. Parts are available online and at most auto supply stores, making this a good choice for a do it yourself project.
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Instructions
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Loosen the screws on all the terminals on the back of your new seven-pin trailer connector.
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Remove one wire at a time from the old connector and transfer it to the new connector. Be sure to install it in the same position on the new seven-pin connector. Remove the wires from the connector by loosening the screw on each terminal.
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Install the wires by referring to this chart to install a seven-pin connector on a new trailer. Be sure to tighten the clamping screws securely.
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Use the proper color code to aid in troubleshooting lighting problems in the future.
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Coat all connection liberally with dielectric grease to prevent corrosion.
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Resources
- Photo Credit Photos by KK Lowell
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Comments
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wascal
Aug 10, 2010
...worthless without that index.
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wascal
Aug 10, 2010
This is actually wrong in a couple of ways. While the color charts match Bargman's idea of how they're used, in actual practice, trailer and vehicle manufacturers have a different standard. If you really want to arrange things to ease future troubleshooting, it goes like this: Ignore the embossed color names on the back of the plug connector, and arrange the colors according to their functional positions. On the normal trailer, Green is RH Turn/Stop, Yellow is LH Turn/Stop; Brown is taillights, which leaves Red to be for backup lighting. The other major problem with this article: There is no rotational index mark nor any numbers on the diagram of the circular connector with the pin arrangement. You would usually see this displayed with the large notch at the "bottom", which in this case is between the pins marked for "electric brakes" and "ground". This diagram is nearly...
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LindaB56
Mar 07, 2009
Very informative article!
