Why is My Right Turn Signal Hyper-Flashing After Installing Curt Trailer Wiring on Jeep?

Updated 10/20/2025 | Published 10/14/2025

Products Featured in This Question

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

(28)

$45.93

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

(192)

$31.31

Question:

I recently installed a Curt wiring harness on my 2012 Grand Cherokee worked great for about 3 weeksI pull my boat 3 or 4 times per week first I got a dash message right turn light out right turn light flashed rapidly when not connected to the trailer the vehicle light works normal this happens sporadically I redid the ground on the right trailer light and installed a new bulb still is a sporadic problem next my taillights on my vehicle quit working I checked my right rear bulb, burned out replaced it and the right side taillight works the left side did not, replaced that bulb but taillight does not work not sure where to begin trouble shooting thanks for any help

asked by: Joe K

Expert Reply:

Hello again, Joe,

I’m sorry to inform you, but you do not have the correct wiring. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 56010 is designed for a 2000–2006 Mazda MPV van. I’m not sure how this was installed, as it does not have the correct connectors for your vehicle.

You will need the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56009 instead. This is the correct harness for your vehicle and should resolve all the issues you’re experiencing.

I tried to look up your order to confirm which wiring harness you purchased, but I don’t see any orders under the email address you’re writing from. Could you please confirm which wiring harness you installed?

expert reply by: Kate F

Joe K.

10/16/2025

Thank you so much for your reply not sure where the numbers got mixed up I did install #5609 I purchased from local auto parts store with the trailer hooked or not I do not have a left side tailight on my 2012 Jeep Grand Cherokee and no tailights on my trailet when it is hooked up

Kate F.

10/20/2025

@JoeK Definitely sounds like something funky is going on with the wiring. It has a 1 year warranty, you will need to either reach out to Curt directly, or the company that you purchased it from. I would try to hook up a different car to the trailer first before reaching out, that way when the lights work fine with the other car, it will tell you it is the wiring and not the trailer.