Remove the wire connecting the keys witch to the magnetic switch (marked S or Start) from the keys witch
terminal.
Connect the positive ( +) lead of digital multimeter, Part Number 3377163, or equivalent, to the keys witch terminal and the negative (-) lead to a chassis or engine ground location.
NOTE: Set the multimeter to indicate DC volts with the keys witch in the OFF position. There must be no voltage
at the keys witch terminal. If the meter indicates voltage, the keys witch is malfunctioning and must be replaced.
Turn the keyswitch to the START position.
The multimeter must indicate system voltage.
If there is no voltage:
• Turn the keys witch to the OFF position.
• Check for supply voltage to the keys witch by connecting the multi meter positive ( +) lead to the keys witch terminal having a wire connecting the keys witch to the starter motor solenoid “B” terminal.
Turn the keys witch to the START position.
If the meter indicates system voltage at the keys witch input terminal, the keys witch is defective and must be
replaced. Refer to the original equipment manufacturer’s manual for replacement.
If the meter indicates no voltage, the keys witch is not the cause of the complaint.
Check the wiring from the keys witch to the starter motor solenoid “B” terminal, and from the starter motor solenoid
to the battery, for broken or damaged wires.
