CHAIN G 0344561 - Caterpillar

Start Relay
Illustration 1 g03877886
Start RelayThe start relay is an output of ESTC II and connects to contact 1 of connector B. The purpose of the start relay is to turn on and off the start solenoid which controls the starting motor. After the operator turns the key start switch to the START position and the control sees that all starting conditions are satisfied, the control then activates the start relay with a +battery signal. In order for the control to activate the start relay, the operator must also have NEUTRAL selected. See the topic Neutral Start Function in the Additional Functions section.The start relay has two terminals and a connector with two contacts. Relay connector contact 1 receives the actuate (+battery) signal from contact 1 of ESTC II connector B. Relay connector contact 2 goes to frame ground. One relay terminal connects to a +battery source of the machine electrical system. The other relay terminal connects to the start solenoid.ESTC II does not record faults that occur with the start signal.