Recommended Wiring Harness for a 2021 Jeep Wrangler Unlimited W/ Park Assist

Updated 11/07/2024 | Published 11/06/2024

Products Featured in This Question

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

(36)

$73.24

Roadmaster Smart Diode Kit for Variable Voltage LED Tail Lights

(256)

$144.73

Question:

I have a 2021 Jeep Wrangler Unlimited with Park Assist. An installation video said something about smart diodes. Can you recommend a product for the tail lights that protect the electrical system and dont activate the Jeeps ECU every time the tail lights go on? Thanks.

asked by: Michael S

Expert Reply:

Michael, since your Jeep has the park assist then you are going to need the Roadmaster Wiring Kit with Smart Diodes for Variable Voltage LED Tail Lights # RM47ZR.

This kit is going to ensure that your LED lights function as they should while being towed, will prevent electrical feedback, and includes two smart diodes, a wiring harness, a split loom, ring terminals and zip ties,

expert reply by: Bryce D

Michael

11/7/2024

The tail lights have a circuit that notifies the ECU if a lamp is out. When the tail light is lit, it sends a signal to the ECU and wakes it up. If the circuit is not interrupted, the battery on the Jeep goes dead in a typical towing day. See this link: https://www.cooltechllc.com/towing-harness-solutionsaccessories/142-jl-wrangler-and-gladiator-led-light-fix.html Does your solution solve this problem?

Bryce D.

11/7/2024

@Michael The wiring harness should not be pulling enough power to drain your battery, so while it isn't a "fix" it also should not be a problem either.

Michael

11/7/2024

@BryceD Many people report dead batteries at the end of the day. Every time a brake or turn signal light illuminates, it wakes up the ECU for about 5-10 minutes. When driving at night, the tail lights keep the ECU active on a constant basis. at a 5-6 amp draw, it can kill the battery. A competitor (https://www.cooltechllc.com/towing-harness-solutionsaccessories/142-jl-wrangler-and-gladiator-led-light-fix.html) has a solution for this. I wrote to Roadmaster about this and their harness doesn't address this. He suggested a charge line from the motor home. In my view, this is a poor substitute than disconnecting the circuit. Thanks for your response.

Bryce D.

11/7/2024

@Michael I see. Unfortunately it appears that the issue will still happen with the harness, so you'd need to get that harness you sent to fix the issue.