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Ford Truck Club Forum > GARAGE TALK > Garage Talk: Shop Class 101



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Old August 28th, 2011, 01:58 PM
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Lightbulb How to Convert a Four Pin Trailer Plug to a Seven Pin

How to Convert a Four Pin Trailer Plug to a Seven Pin

Camping trailers may require a six- or seven-pin trailer electrical outlet. While some automobiles are wired to tow a trailer, not all trailers can be plugged into every electrical outlet. If you plan to tow a large trailer, the trailer plug will often contain six or seven electrical pins. The trailer electrical outlet that is factory-installed normally contains only four pins. Therefore, to tow a large trailer, it will be necessary to tap the electrical connections on the four-pin plug to install a seven-pin trailer connection.

Things You'll Need
Automobile with installed four-way trailer electrical outlet
Drill
Sheet metal screws
Screwdriver
Seven-way automotive-side wire harness
Electrical pliers
Crimp-type terminal splice connectors

1
Drill a hole under the rear bumper on the bottom left side of the automobile. Ensure that this hole is no more than 4 inches away from the installed four-way trailer electrical connector.

2
Place the frame of the seven-way harness so that the harness mounting hole lines up with the hole drilled in the bumper. Insert the screw into the mounting hole, and tighten the screw to hold the harness to the bumper.

3
Place a wire splice connector over the four-way outlet's green wire. Place the green wire from the seven-way harness into the splice connector, and crimp the terminal to join the wires.

4
Place a wire splice connector over the four-way outlet's yellow wire. Place the yellow wire from the seven-way harness into the splice connector, and crimp the wires together.

5
Place a wire splice connector over the four-way outlet's white wire. Place the white wire from the seven-way harness into the splice connector, and crimp the connector to make the electrical joint.

6
Place a wire splice connector over the four-way outlet's brown wire. Place the brown wire from the seven-way harness into the splice connector, and crimp the wires together




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