Headlight issues on my JK - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 5 Old 12-05-2016, 04:44 PM Thread Starter
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Headlight issues on my JK

I have THESE headlights and ever since I bought the jeep randomly I'd have a flicker. Lately its gotten worse and now its pretty bad.

I'm almost positive its a short in the body harness. We've checked the lights and the wire harness for the headlights and they all seem to be fine. We sanded down the contacts and coated them now to help prevent water.

Right now as we sit, the headlights don't work at all, but the passenger hibeam does. This is not a permanent set up though as they'd work randomly in different ways. Last few days when I first turn the jeep on, the driver side would not turn out, wiggle the wires and it'd work. It seems to work randomly when it wants to and we're a bit stumped.

anyone have any experience with this? I had the two headlights working earlier today, then only one and now none at all at the moment.

This is my Signature
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post #2 of 5 Old 12-05-2016, 05:09 PM
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for what it's worth, I had a similar sounding problem with my stock tail lights, specifically the passenger rear. it ended up being poor connectivity in the wiring harness. I put conductive grease on the pins, connected and disconnected the harness about a dozen times, and it's been trouble free for the last 1,000 miles...
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post #3 of 5 Old 01-08-2017, 11:38 AM
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Quote:
Originally Posted by mvjeeper View Post
I have THESE headlights and ever since I bought the jeep randomly I'd have a flicker. Lately its gotten worse and now its pretty bad.
I wonder if you may have two different problems. The flicker could be caused by Jeep's Pulse Width Modulation (PWM) of the headlight wiring. Jeep pulses the headlight supply power many times per second. You don't notice that on an incandescent bulb, but it is noticeable on LED bulbs. I'm sure KC Lights sells anti-flicker modules (one per light needed). There are also after-market modules on Amazon for cheap. All that is in each module is a capacitor, which smooths out the voltage spikes.

The other problem could be defective lights, or bad wiring connections.

Good luck...
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post #4 of 5 Old 01-08-2017, 11:56 AM
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Are the symptoms the same when the ignition is off as when the engine is running?

What's the wattage of the LED headlights?

2008 Unlimited Rubicon Automatic
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post #5 of 5 Old 01-08-2017, 02:52 PM
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Quote:
Originally Posted by ronjenx View Post
Are the symptoms the same when the ignition is off as when the engine is running?

What's the wattage of the LED headlights?
^^^^What he said ^^^^^^^

This is common , if you turn on headlights without starting engine you will be on direct battery voltage (direct current) , with engine running you will be on TIPM or Pulse width modulation .
This has the effect of the TIPM thinking that you have a filament burnt through and the TIPM no longer sends signal voltage to that light , the resistor and capacitor that are in PWM harness adaptors corrects this by (fooling the TIPM) showing resistance to the circuit .
Whereas a LED has very low resistance and will not allow the TIPM to energize the light circuit .

Hope that makes sense , that is the best I could articulate what's happening to your lights .
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