Re: Flat Towing Problem – Jeep Grand Cherokee 2014
During 40 years in electronic repair I have seen shorted diodes.....but I have not seen any of these heavy duty, dual input - single output diodes shorted input to input where the coach system could feed back into the Jeep system. That don't mean it can't happen but I have not seen that. I agree that most diode failures are opens.
When I started to wire my '11 JGC the first thing I did was remove a tail light bulb and then turn the ignition to ON. I saw a message in the EVIC that the Left Rear tail light was out. It flashed up there for a few seconds and then it was gone. That made me think that the tail light circuit was monitored by some system in the Jeep. I was afraid of wiring the coach lights to the Jeep lights with diodes because the sensor could be on the ground side of the tail light circuit and I also had a ground back to the coach through the tow bar. Anyway, being a coward I opted to install the Blue Ox separate light bulb kit.
I had used the diodes on my two previous tow cars, a Geo Tracker and a Jeep Liberty, but with all of the electronics, data busses, and processors on these new vehicles I was leery of inducing any foreign voltages and grounds into the system.
2011 Grand Cherokee Laredo X 4x4 V6
2014 Grand Cherokee Limited 4x2 V6