geegee Posted August 15, 2016 Report Share Posted August 15, 2016 When I connected my Motorhome to my car the brake lights came on the car. When disconnected all lights worked normally. Does anyone know what cause this ? Link to comment Share on other sites More sharing options...
Mark and Dale Bruss Posted August 15, 2016 Report Share Posted August 15, 2016 Obviously the connecting cable is mis-wired. What kind of plug at the toad end? Please click for Emails instead of PM Mark & DaleJoey - 2016 Bounder 33C Tige - 2006 40' Travel SupremeSparky III - 2021 Mustang Mach-e, off the the Road since 2019 Useful HDT Truck, Trailer, and Full-timing Info atwww.dmbruss.com Link to comment Share on other sites More sharing options...
Kirk W Posted August 15, 2016 Report Share Posted August 15, 2016 Welcome to the Escapee forums. We are here to help so will do our very best to find an answer. It would seem that the 12v supply from the motorhome is connected to the brake light lead of the car, in some way. While it may be incorrect wiring of the plug, if your car don't have the isolation diodes installed or installed properly that also could be the cause. Is this a problem that just began to happen with a car & motorhome which have been mated previously with everything working properly, or was the car just recently wired? Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
geegee Posted August 16, 2016 Author Report Share Posted August 16, 2016 First time it did it was sunday. Link to comment Share on other sites More sharing options...
Kirk W Posted August 16, 2016 Report Share Posted August 16, 2016 You may have a blocking diode that has failed(shorted). About the only way to trouble shoot it would be to get your meter and trace the voltage to and from the source. If you look at the box, sometimes you can see a defective diode from discoloration, but you need a meter to prove it. Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
BigRich Posted September 2, 2016 Report Share Posted September 2, 2016 I bet it's in the black box. The diode wouldn't cause this, since all it does is block the power from going to the front of the toad. Sounds more like a short in the box. http://rtrvg.com/blog/ 2004 Coachman, F-53, 36' Link to comment Share on other sites More sharing options...
kayakbob Posted November 28, 2016 Report Share Posted November 28, 2016 Hot charge wire in plug crossed with brake lite ? Link to comment Share on other sites More sharing options...
Wrknrvr Posted November 28, 2016 Report Share Posted November 28, 2016 Meter time to find the problem. Vern Link to comment Share on other sites More sharing options...
Kirk W Posted November 29, 2016 Report Share Posted November 29, 2016 It has been since Sept. 1, so I hope the problem is solved by now. Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
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