826G Landfill Compactor, 825G Soil Compactor, 824G Wheel Dozer and 980G Wheel Loader Power Train Electronic Control System Caterpillar

Illustration 1	g00288434
Start Relay

The start relay is an output of the power train electronic control module (ECM). The activation and deactivation of the start solenoid is the purpose of the start relay. The start solenoid controls the starting motor. When the operator turns the key start switch to the START position and the power train ECM decides that all the starting conditions are satisfied, the power train ECM activates the start relay with a +battery signal. The operator must also have the direction switch in the NEUTRAL position. Refer to System Operation, "Normal Operation" for more information about Neutral Start Operation.

The start relay has a connector with two contacts. One contact receives power from connector contact 38 of the power train ECM. The other contact returns to connector J2 contact 3 of the power train ECM.

Terminal 3 of the start relay connects to a +battery source. Terminal 4 connects to the start solenoid.