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Parts Needed to Operate Electric Brakes on Roadmaster Tow Dolly to Tow a 2014 Fiat 500L


Have T-one wiring harness 18611 installed on 2014 fiat 500L,need to connect roadmaster tow dolly model RM-3477 to existing R/V 7-pin connector! Can I use Polak pk12706 to connect everything together? Have Tekonsha P-3 brake controller installed in workhorse w20 chassis!


Expert Reply:

It sounds like you're trying to power the lights and brakes on the Roadmaster RM3477 tow dolly. To do this you will not want to connect the dolly to the Fiat that's being towed but rather to the RV that's towing it.

I assume the RM3477 has a 4-way connector on it because Roadmaster dollies often do. Even though they need a 7-way to power the brakes. What you'll need is a 7-way trailer connector like # 277-000141. This has a junction box attached to it which will make it easier to connect the wiring on the dolly.

You'll cut off the existing 4-way on the dolly and connect the wires to the junction box. Then you'll need to run wires from the electric brakes to the junction box. If you need more wire use # 10-1-1 which is sold by the foot. You'll also need ring terminals # 44-5310A to make the connections at the junction box.

expert reply by:
Charles S

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