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Old 10-28-2018, 10:56 AM   #4
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Join Date: Oct 2009
Posts: 7

I've done this upgrade on several RVs and one thing stands out; do you have the blue electric brake wire at or near the trailer hitch?

If so, the upgrade will be easier as that blue wire runs up to the brake pedal area and very likely to the factory chassis connector for the brake controller. They are often tucked up and attached to the steering column.

I suggest starting at the four pin connector and trace the wires for 2-3 feet. Hopefully, you will find that blue wire, taped back and ready to add to your 7 pin connector.

If you're really lucky, the same track-back will lead you to the 7 pin.
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