CYLINDER ASSEM. 8J8765 - Caterpillar

control board provides one spare fault input (Contact 12). Devices from the factory or a device that is provided from the customer can be connected to the spare fault input. Some of the optional factory devices that can be connected to the spare fault input are listed below.
Engine Coolant Loss Sensor
Over/Under Voltage Relay
Ground Fault Relay
Low Fuel Level Switch
High Fuel Level SwitchA battery negative signal ("B-") at the spare fault input causes the control board to respond in a preselected manner (alarm or shutdown). The spare fault input is found at Contact 12 of the control board. For the spare fault, the Fault Protection Timer (FPT) is selectable. For more information, see Systems Operation, "Fault Management".In order to troubleshoot the spare fault indicator, use a process that is similar to the preceding procedures for fault indicators.
Check for obvious causes that are related to the responsible device.
Check the function of the responsible device. Reset the fault by opening the Remote Start Switch and verify that the fault still exists.
Disconnect the responsible device from the wiring of the generator set. Verify whether the fault still exists.
Check for an unwanted short to the battery negative terminal at Contact 12 of the control board.