Can I jump start my toad from my motor home?

CRJGal wrote:
I guess I should have been more specific. First of all, thanks for the many replies. We have had this braking system since 2007, and never had a problem. Just this year, on the past 3 trips, with the brake hooked up, we have had a total discharge of the battery. (We have a 2008 Jeep Grand Cherokee being pulled by a 2005 Fleetwood Providence.) The Jeep does not require any fuses to be pulled, and does not require starting the car at interim stops.

We have had all systems checked out, and narrowed it down to the tow brake system, which is kind of what we thought from the jump. We don't know if there is some kind of diode that is allowing electricity to flow from the Jeep to the coach, or some other problem.

That being said, until we can get the problem fixed, we hate to keep imposing on others for a jump and thought perhaps we could do it ourselves. You all bring up many interesting points!

I sort of wondered since the Unified Tow Brake system is no longer available. I would trace the wiring from coach battery through the pigtail to the tow'd. Also it may be that the car battery is just dead/dying as others have suggested.

To the best of my knowledge the only item between the batteries is a fuse, although on second thought there may be a diode at the tow'd end of the connection, too lazy to run out to my Jeep to look, also dressed in "nice" clothes for a day in the city :B