2018 Jeep Wrangler Unlimited Sahara JL Wiring for Flat Towing

Question:

I have been researching the wiring needed to equip the 2018 Jeep Wrangler Unlimited Sahara JL for 4 wheel flat towing. I have read it requires an RM88400 relay to be installed. The Jeep has push button ignition. I read another account where a brake light switch had to be installed. I am confused can you clarify for me?

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Expert Reply:

For your 2018 Jeep Wrangler Unlimited Sahara JL flat tow wiring, you will need the Roadmaster Stop Light Switch Kit # RM-751490 which will communicate with your motorhome's brake monitoring system that your Jeep brakes are being applied. This is to help you know if a problem is occurring like your Jeep brakes constantly being applied so you can solve an issue before damage occurs. I reached out to my tech contact at Roadmaster and you will not need the relay # RM-88400 because the factory stop light switch will time-out so it won't remain active when flat towing.

For the other wiring, I recommend the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267. This will give you a 6-way trailer connector on the front of your Jeep and will allow you to use diodes to protect your electronics while utilizing your factory wires. I recommend also adding the charge line kit # RM-156-25 to maintain your Jeep battery while towing.

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Jason S

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Question:

I have read the instructions for the brake light switch kit and it refers to a monitor or even brake. I plan on purchasing your Blue Ox Patriot braking system would the brake light solution be different?

asked by: Gary B

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Expert Reply:

When using the Blue Ox Patriot Radio Frequency, Portable Braking System # BRK2016 you will still need the stop light switch # RM-751490 but not the relay # RM-88400. This will provide the stop light signal needed once the factory stop light times out and the Patriot II will work just like the Roadmaster Evenbrake system # RM-9400 you referenced. These braking systems use an inertia sensor for detecting deceleration and brakes in proportion to your motorhome's deceleration. It has adjustable sensitivity and a manual override in the wireless remote control.

To power the Patriot II, you will need the 12 Volt Outlet Kit, 20 amps # RM-9332 to connect to your Jeep battery. If power is lost to the unit, it does have a backup battery that will allow operation for up to 30 minutes.

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expert reply by: Jason S
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Jason S

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