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... view full answer...
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