Starter Solenoid: Testing and Inspection

Fig. 20 Delco Starting Motor Test Connections:

Complete each test within three to five seconds. If time limit is exceeded, possible damage to the starter solenoid may result.
If the solenoid is not removed from the starting motor, the connector strap terminals must be removed from the terminal on the solenoid before making these tests. Complete tests in a minimum amount of time to prevent overheating of the solenoid.
1. Hold-in test.
a. Connect a ammeter in series with a 12 volt battery and the ``switch'' terminal on the solenoid.
b. Connect a voltmeter to the ``switch'' terminal and to ground as shown in Fig. 20.
c. Connect a carbon pile across battery.
d. Adjust the voltage to 10 volts and note the ammeter reading. It should be 14.5 to 16.5 amperes for all starting motors.
2. Pull-in test.
a. Connect as previous test.
b. Ground the solenoid motor terminal.
c. Adjust the voltage to 10 volts and note the ammeter reading. It should be 41 to 47 amperes for all starting motors. Current will increase as windings heat up.
3. Current draw readings over specifications indicate shorted turns or a ground in the windings of the solenoid and the solenoid should be replaced. Current draw readings that are under specifications indicate excessive resistance. No reading indicates an open circuit. Check connections then replace solenoid if necessary.