Series 50 – Section 18.3 Defective Starter

Section 18.3
Defective Starter

To determine if a defective starter is causing no start, perform the following steps:‪

1. Place the red lead of a voltmeter to the solenoid "BAT'' terminal; see Figure "Cranking Motor Available Voltage Test" .
   

   1. Black Voltmeter Lead‪	4. Harness Tube‪
   2. Starter Ground Terminal Lug‪	5. Volt Ohm Meter‪
   3. Red Voltmeter Lead‪	‪

   Figure 1. Cranking Motor Available Voltage Test

2. Place the black voltmeter lead to the starter ground terminal; see Figure "Basic Cranking Circuit" .
3. Engage the starter switch.
4. View the voltage reading on the meter.
   1. If the voltage is less than specification while cranking the engine, starter replacement is necessary; refer to "18.3.1 Starter Replacement" .
   2. If the voltage is to specification while attempting to crank the engine, check for internal damage; refer to "18.4 Internal Engine Damage" .

Section 18.3.1
Starter Replacement

Perform the following for starter replacement:‪

1. Replace the starter; refer to "8.5.1 Replacement of Cranking Motor" .
2. Verify replacement of starter; refer to "18.3.1.1 Test Engine with New Starter" .

Section 18.3.1.1
Test Engine with New Starter

Perform the following to determine if the new starter resolved no start condition:‪

1. Attempt to start and run the engine.
   1. If the engine starts and runs, no further troubleshooting is required. Shut the engine down.
   2. If the engine fails to start or run, check for internal engine damage; refer to "18.4 Internal Engine Damage" .