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Old 08-10-2019, 01:29 PM   #1
l2r
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Anyone with trailer wiring experience?

Hello everyone

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
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Old 08-10-2019, 01:46 PM   #2
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Cal Demco and ask for Brian. Heíll walk you thru it.
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Old 08-10-2019, 03:12 PM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

I guess I'm missing something! If everything is working why are you concerned?

Good luck, happy trails, and God bless!
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Old 08-10-2019, 10:57 PM   #4
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Quote:
Originally Posted by l2r View Post
Hello everyone

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.
.
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Old 08-18-2019, 08:32 PM   #5
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Quote:
Originally Posted by l2r View Post
Hello everyone

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
If by test light you mean the 3-LED Red one that lights with the SMI is operating..

How you hook up the LED indicator depends a lot on the vehicle you are towing. If you don't want to cut into the wiring under the dash then...

The blue wire from the SMI will indicate it is operating the pump. Connect the LED lighting to the blue wire and ground.

Check out this post, I don't want to repeat it...I went bit further with my install.

Towed Braking Question

I did a bunch of other posts on this subject, it was a PITA to find the right answers - Brian was a huge help.


Oh...and not to disparage SMI...the LED indicator they supply doesn't show up for beans in bright sun on a black-white backup camera. I switched it out with some wicked bright LED strobes I got off Amazon.

Ron
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