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About a year ago, I installed a KC Headlight conversion into my 2013 Jeep JKU with PIAA H4 bulbs. since then I have had to replace the wiring harness supplied by KC 3 times on the drivers side headlight. Does anyone have any ideas what may be causing this and how to fix it?

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I thought I was having same issue with my KC harness on the driver side also. Went back to stock and finally discovered the problem is with the factory harness. If I wiggle the wires going into the back of the harness the light works fine. The problem I have is total loss of drivers side light. Might check that.
 

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I had this same issue and even after upgrading to new headlights was still having problems. It was at that point I figured out that it was a problem with the harness on the Jeep. Tried fixing with electrical tape but it just wasn't holding so I caved and went to the dealer to have them replace both harnesses. Worked fine for about a month and now the passenger side is out again. Don't know what the deal is.
 
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