What was found
REPORT THAT RADIO INDICATOR BACKLIGHTING AND RADIO CONTROL BACKLIGHTING HAD NOT WORKED SINCE DELIVERY OF AC. TROUBLESHOOTING, FOUND THAT PIN 1 OF JC005 WAS AT GROUND POTENTIAL, PREVENTING DIMMER POTENTIOMETER FROM FUNCTIONING PROPERLY. REMOVED WIRE FROM CIRCUIT, WIRE THAT HOOKS INTO WARNING / CAUTION ANNUNCIATOR. RADIO LIGHTING WORKED CORRECTLY. THE WAY SWITCH WAS INTERGRATED INTO SYSTEM WAS CAUSING HARD GROUND CONDITION.