UENR0623-02 91 Electrical System Illustration 77 g00584419 Typical 24 V starting circuit (1) Test point (2) Test point (3) Test point (4) Test point (5) Test point (X) Hold-in coil (W) Pull-in coil Diagnosis Procedure for 12 V 4 kW Starting Motor Test” for the correct procedure. Note: Low battery voltage can be caused by the condition of the battery or a shorted starting motor. If the starting motor does not crank or cranks slow, perform the following procedure: 1. Perform a visual check on the starting motor and the circuit. Record any appropriate observations. 3.
Measure the current that is sent to the T31 terminal on the starting motor solenoid from the positive post of the battery with a suitable ammeter. The maximum current that flows to the T31 terminal should be equal to 1000 amp or the maximum current that flows to the solenoid should be less than 1000 amp. Ensure that all cables and connections are clean and tight. Ensure that any lead wires are not shorted. If the current is too great, a problem exists in the starting motor. Replace the starting motor. 2. Measure the voltage of the battery. Measure the voltage across the battery posts with the multimeter when you are cranking the engine or attempting to crank the engine.
Do not measure the voltage across the cable post clamps. Note: If the following conditions exist, do not perform the test in step 3 because the starting motor has a problem. a. If the voltage is equal to or greater than the voltage in table 14 , then go to step 3. The voltage at the battery post is within 2 volts of the lowest value in the applicable temperature range of table 14 . b. The battery voltage is less than the voltage in table 14 . Test the battery. Refer to Systems Operation, Testing, and Adjusting, “Battery - The large starting motor cables get hot.