Like many of you I have had trouble with my TIPM causing various lights to not operate. I have previously had my Jeep dealer replace the TIPM and this fixed the issues. Recently my drivers side headlamp would not work so I thought that my TIPM had gone bad again. I decided to buy a used TIPM off of eBay and replace it myself. This did not fix the problem. I then thought about the problem some more. It would be very unlikely that two TIPMs would have the same failure mode. I then looked deeper in this forum and found references to bad grounds causing all kinds of electrical issues. I removed the headlamp plug and used my VOM to measure resistance from the middle connection (ground) to the chassis ground. It showed open. I then spliced a wire from the middle of the plug and connected it to the chassis ground. Low and behold the headlight now works.
Laseron
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