RING 1P9646 - Caterpillar

STEP 1. Check Locomotive Control Box Diagnostic Lamps Test Procedure:Observe the diagnostic lamps visible at the Control box lid. Expected Results:A system fault code is displayed by the diagnostic lamps. If more than one fault exists, the faults are displayed consecutively at 5 second intervals. Troubleshoot multiple faults in the order listed below. STEP 2. Check Connections to Warning Light Test Procedure:Troubleshoot Warning Lamp Relay in junction box and wiring from relay contacts to warning light, looking for short circuits or intermittent connections. Expected Results:No short circuits or intermittent connections are found. STEP 3. Check Power Supply to Control Box Test Procedure:Stop engine. Disconnect connector J1 from Locomotive Control box. Measure the DC voltage between harness connector J1 pins 8 and 9 while the harness leads are manually shaken. Expected Results:The battery voltage applied to the control box is constant and between 64 and 110 volts DC.