FLOOR MAT 3423689 - Caterpillar

starting motor magnetic switch (SMMS) for the 24 DCV systems is mounted on the subpanel within the control panel. Test Procedure
Disconnect the jumper wire between terminals TS1-4 and TS1-5 in the control panel. Measure the resistance between terminals TS1-5 and TS1-2.
The resistance should measure 26 to 33 ohms for the systems with one starting motor. If resistance is NOT correct, replace the defective magnetic switch. If the resistance is correct, proceed to step 2.
Disconnect the cable that is going from the pinion solenoid to the starting motor.
Connect a DC voltmeter. Connect the positive cable to terminal TS1-24 and the negative cable to terminal TS1-25 in the generator housing.Note: The jumper wire of step 4 can remain connected for only ten seconds.
Connect a jumper wire from terminal TS1-1 to terminal TS1-5 in the generator housing. Disconnect this wire immediately after the voltage is measured. Do not leave the wire on more than 10 seconds. The correct measurement changes from approximately 24 DCV to approximately 2 DCV.If voltage is greater than 2.0 DCV, then replace the magnetic switch. If the switch passes the requirements of step 1 and 4, the switch is functioning correctly. Reconnect the wires and cables that were removed in this procedure.