Starter Solenoid - Chevrolet Trailblazer Service Manual

Starter Solenoid

1. Disable the fuel system by removing the fuel pump fuse or the fuel pump relay.
2. Verify that the vehicle will not start.
3. Connect the positive lead of the voltmeter to the case starter B+ terminal.
4. Connect the negative lead of the voltmeter to the lug (the starter M terminal) that
connects the starter solenoid to the starter motor.
5. Turn the ignition key to the START position and note the voltage displayed on the
voltmeter.
Ideally, there should be no more than 0.2 volt drop across the starter
solenoid displayed on the voltmeter.
In general, there should be no more than a 1.0 volt drop throughout the entire starter motor
feed and ground circuit. Any voltage drops measured in either the feed or ground circuits
after connections have been cleaned will require replacement of the affected battery cable.
Typically, any voltage drops measured in the solenoid are repaired by replacing the starter
motor.