May be a long shot but easy to check... I would look at the ground wire off the battery to the block. I had the same symptoms a while back and found that it was exactly that. Got new battery wires and terminals and installed and cleaned the area it attaches to the block for clean solid contact and voila.
93 YJ, 6 cyl,3.5" BDS,1" Prothane BL,1/2" booms, 33" Mickey Thompson MTZ on MT Beadlocks.
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