LED Blinker & Brake Lights Malfunction

Rick2004LJ

TJ Enthusiast
Original poster
Supporting Member
Joined
Jun 11, 2018
Messages
165
Location
Texas
The LED blinker light Gremlins are all over me and I really don’t even know where to start troubleshooting. When I did flat fenders which included the little LED marker light and blinker I swapped the flasher and all was good. Since then we have trailed it hard and added led tail lights and headlights. Here is the current chaos.

Right Blinker - all good

Left blinker - fast flash front rear and dash. And the dash right blinker dimly flashes?

If I dare to use the Emergency flashers the right tail works but left tail light dimly blinks and the Odometer flashes?

When I hit the brakes the right taillight works the left does not. AND the odometer and right dash turn signal blinks.

When the headlights are on all bets are off. All the tail lights work but the dash right blinker comes on solid and at random times the left blinker fast flashes? When Right turn signal everything works. When left turn signal is used the left tail light goes out and both dash blinkers go solid.

Anyone wanna take a shot at troubleshooting all of that crap?
 
The LED blinker light Gremlins are all over me and I really don’t even know where to start troubleshooting. When I did flat fenders which included the little LED marker light and blinker I swapped the flasher and all was good. Since then we have trailed it hard and added led tail lights and headlights. Here is the current chaos.

Right Blinker - all good

Left blinker - fast flash front rear and dash. And the dash right blinker dimly flashes?

If I dare to use the Emergency flashers the right tail works but left tail light dimly blinks and the Odometer flashes?

When I hit the brakes the right taillight works the left does not. AND the odometer and right dash turn signal blinks.

When the headlights are on all bets are off. All the tail lights work but the dash right blinker comes on solid and at random times the left blinker fast flashes? When Right turn signal everything works. When left turn signal is used the left tail light goes out and both dash blinkers go solid.

Anyone wanna take a shot at troubleshooting all of that crap?

Have you looked at the multi function light switch behind the steering ? I had issues as you described, and came to find out the multi function switch plug had melted, come issue.
I replaced mine and all is good
 
I am thinking ground on that left side. To much resistance of a dirty ground is causing the left side to get funky. Dash light right blinker might be a separate anomaly.
 
So where are all of the grounds in the system to check?

I would check wiring diagram but all the lights have to be grounded I would start there. Those won’t be to hard to find and clean. Taillight ground through the mounting bolts. Pull the lense take the bolt out and chase the threads. Could just be as simple as that… and it may not… wiring diagram link below.

https://wranglertjforum.com/threads...ice-manuals-fsm-technical-documentation.4618/

Let us know how it goes. I was chasing why my headlights would not work. Ended up playing with the multi function switch as I was waiting for the one I ordered. Pulled the back off cleaned the internal contacts in there. Reassembled and ta-da lights again. Could have just the process of taking the external connector off and on or the extra work going inside the switch….but it is probably going to be something like that
 
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