Originally Posted by l2r
I bit about me.
I am new to rving and wanting to get out as soon as my rig is ready.
I installed a tow plate and a Hopkins, trailer wiring kit 56200 on my Jeep and it works fine. Tap on the rv brakes, and the Jeep brakes light up.
Just installed an SMI duo brake kit.
I have been thru this twice and believe the wires from the controller and operating unit are correct as well as the turn signal and ground connections.
There are various and conflicting videos out there thru etrailer.
The official instructions are dated, having you get into the Jeep wiring when it is probably best to access the just installed wiring harness.
My biggest, known issue, is the LED test light. I have 3 shown ways of how to connect it but none work.
Anyone with an idea, I would be glad to try it. thanks
It looks to me that the LED light is meant to be a visual signal that the Jeep's brake pedal is actually being depressed by the braking system. It has two wires. One wire connects to the Jeep's brake light switch wire that becomes energized when the pedal is depressed. The other wire of the LED light is connected to the braking system ground wire.
I see some possible issues:
1. The Jeep wiring diagram I have seems to show that there is more than one switch on the brake pedal. One switch is for the brake lights, and one is for the ABS and cruise control. You must test the voltages on the wires to make sure that you are using the wire that becomes hot only when the pedal is depressed. This is the wire which also goes back to the 'third brake light' on the rear of the vehicle.
2. Depending on the vehicle, the brake lights might not work when the ignition key is off, and there is no power to the brake light switch at all. In this case, the Demco wiring diagram shows a dotted red line"Alternate wiring..." to use instead of trying to wire the brake switch.
3. LED lights themselves are sometimes polarity sensitive and won't work if wired backwards.