Transcender
New member
Hi, my new/old '98 JT is heading to the shop for inspection and I have a headlight issue that I'd like to fix before it gets there. The low beam does not work on the driver side sealed beam lamp. High beam works fine. I have no voltage at the lamp connector. I do have continuity from the plug back to the other end of the wiring harness. The harness runs back and plugs into a "Isolation Module". I haven't found any info on what this does. Could this be the problem? Can I bypass this isolation module? Thanks for any guidance and ideas on what else to look for.