B5.9G, B5.9LPG – Troubleshooting and Repair Manual – 013-017   Starter Magnetic Switch

WARNING  Be sure the starting motor switch is in the OFF position to prevent electrical shock and personal injury.

Digital Multimeter, Part No. 3377161

Remove the cable connecting the magnetic switch to the starting motor solenoid from the magnetic switch terminal.

Connect the leads of digital multimeter, Part No. 3377161, or equivalent, to the two large switch terminals.

Set the multimeter to measure resistance (OHMS).

With the starting motor switch in the OFF position, the multimeter must indicate resistance at infinity.

Turn the starting motor switch to the START position.

The multimeter must indicate zero or very little resistance.

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

• Turn the starting motor switch to the OFF position.
• Set the multimeter scale to read DC voltage.

• Connect one multimeter lead to the magnetic switch terminal marked “S” and the other lead to the ground.
• Turn the starting motor switch to the START position.
• If the multimeter indicates no voltage, the magnetic switch is not the cause of the complaint.
• If the multimeter indicates voltage, the magnetic switch is defective and must be replaced.

• Turn the starting motor switch to the OFF position.
• Remove the multimeter leads, and connect the magnetic switch to the starting motor solenoid wire.