The grounds on these are notoriously bad. I'm sure if you haven't already done so, it would be a great idea to look into a dedicated ground system. It is really easy to do, and you will see improvement in your headlights, wipers, etc etc. Newer vehicles new this was a good idea, because the ground method used by these older cj's was pretty much meant to do things in the most cost effective, inexpensive manner.
Year/Model: '86 CJ7 - Engine: 258 I-6 - Lift: Pro Comp 4" - Tires: 33X12.5 - Nuttered - Team Rush'd - Howell TBI