Cummins ISX11.9 CM2250 – Service Manual 013-017   Starter Magnetic Switch

WARNING  Be sure the starter switch is in the OFF position to prevent electrical shock.

Remove the cable connecting the magnetic switch to the starter solenoid from the magnetic switch terminal.

Connect the leads of the digital multimeter, Part Number 3377161, to the two large-switch terminals.

Set the multimeter to measure resistance (ohms).

With the starter switch off, the multimeter must indicate resistance at infinity, open circuit.

Turn the starter switch to the START position.

The multimeter must indicate 0 resistance, closed circuit.

If the multimeter indicates resistance at infinity with the starter switch in the START position:

• Turn the starter switch off.
• Remove the ground wire that is connected to one of the small magnetic switch terminals.

• Set the multimeter scale to indicate volts, 24 VDC or more.
• Connect the positive (+) lead of the multimeter to the magnetic switch ground terminal and the other lead to the ground wire.
• Turn the starter switch to the START position.
• The multimeter must indicate vehicle electrical system voltage.

• If the multimeter does not indicate voltage, use the following procedure to check the starter switch. Refer to Procedure 013-018 in Section 13.

• Turn the starter switch to the OFF position.
• Remove the multimeter leads.
• Connect the starter solenoid cable to the magnetic switch terminal and the ground wire to its corresponding terminal on the magnetic switch.