Tow Vehicle Problem

I'm assuming you are following the directions listed in your owners manual...correct? Supplemental braking devices that plug into your toad's cigarette lighter do draw a lot of amperage from the battery and in these cases, you really need to have a 12v line from the motor home's battery(s) to the toad's battery. Most motor homes have this wire going to the 7-pin connector, but may not be connected. Check the voltage on, I believe, pin 4.

Good luck

Ron

ps... the "tow" vehicle is the vehicle "doing" the towing...not the one "being" towed. Hence the name "toad".

If your battery is weak and you use a supplemental braking system, that can be a good size draw in a day long drive. Be sure you have a charge line and good battery. Here's to happy towing!

What mountain air said, plus you do have a charge line from the MH to the toad, right? I just may be that the toad battery is failing.

If you don't get a good answer, Install a diode in the charge line from the rv and if the power from the tow is flowing back to the Rv that will stop it.

You have check to ensure that you have power 12v from the RV to the tow vehicle. the Blue Ox braking system does use power from your tow vehicle. I am assuming that the connected tow line is 12v from the RV to the tow vehicle's battery.

That line also should have a fuse , ensure that it is not bad.