SHAFT A-L 3B8901 - Caterpillar

Indicator Lamp Is Always Flashing
This procedure is for the parameter that has the indicator lamp that flashes all of the time. The "Always Flashing" condition is probably caused by an undesired open circuit. Also, the Main Display Module may cause this problem (unlikely condition).
Locate The Switch.
Turn the "ECS" switch to the OFF/RESET position.
Locate the switch that corresponds to the parameter that is always flashing the indicator lamp. If necessary, use the Electrical System Schematic in order to assist in locating the switch.
Check for loose terminal connections or corroded terminal connections to the switch.
Clean corroded terminals and tighten loose connections.
Check The Harness.
Disconnect the signal wire