Almost positive I've got a bad ground somewhere in between the Rear LH/Rear RH Courtesy Switches and the Dome light. As so many dome light threads have gone, the rear dome will come on while switched to ON position, but does nothing when switched to DOOR. Additionally, the little panel lights at the bottom of both LH and RH Rear doors do not light up in any situation. I've verified all bulbs are good and both Courtesy Switches have been cleaned, tested, and put back on. Somewhere between the single-wire connection after the switches and the connector to the dome I'm losing my ground connection. Front dome light/front map light/front door panel lights all work as designed. Is there a spot in the wire routing that is notorious for losing the ground in this circuit? Am I missing something easier than following the wiring from start to finish? Not sure if it's related to this grounding issue, but I have engine interference coming in through the speakers while running. 1995 FZJ80, no cargo dome light installed.