FAULT TREE DIAGNOSIS Payload Lights Won't Illuminate The load lights are illuminated for 5 seconds after the keyswitch is turned ON. The load lights are powered through a 15A breaker on relay board 2 (RB2). The Light Control Relay (LCR) is activated by a ground signal through the brake lock switch. The brake lock switch must be closed to complete the circuit through the LCR relay and power the load lights. Each light color is controlled by a relay on RB2. Each load light relay coil is grounded through the payload meter to activate the light. There is one relay for each color light. If the load lights do not illuminate during loading, verify the brake lock is being used at the loading site.
Verify that the lights illuminate when the keyswitch is turned ON. If not, check the 15A circuit breaker and the LCR relay, first. Then, check the brake lock signal to the relay board. Ensure that the connections to the relay board are solid. M20-38 Payload Meter II™ Troubleshooting M20007.2 3/02