ELECTRICAL TROUBLESHOOTING - continued - TM-9-2320-386-24-1-10086

TM 9-2320-386-24-1-1

0012 00

Electrical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 3. Check for battery voltage at starter solenoid.

Step 1. Set multimeter to a voltage range that will measure 24 Vdc.

Step 2. Check cable 6 at starter solenoid for battery voltage.

If battery voltage is not present, clean connections of cable 6 at starter solenoid.

END OF TESTING!

STARTING SYSTEM

2. STARTER WILL NOT CRANK

NOTE

Ensure transmission gear shift lever is in NEUTRAL position.

Test 1. Check batteries and cables (malfunction 1).

Test 2. Test for battery voltage at starter solenoid with accessory/battery switch turned to ON

position.

Step 1. Engage accessory/battery switch and listen for starter solenoid to "thump" sound when

energized.

a. If "thump" sound is heard, go to step 2.

b. If "thump" sound is not heard, go to step 3.

Step 2. Check lead 6 at starter solenoid for battery voltage.

a. Check for seized engine (WP 0009 00, Mechanical Troubleshooting, malfunction 1).

b. If voltage is present but less than 19 Vdc, check for corrosion and/or loose

connections.

c. If engine is not seized, replace starter motor (WP 0091 00).

d. If no voltage is present and engine still fails to start, go to step 3.

Step 3. Check lead 214 for battery voltage at starter solenoid.

a. If voltage is not present, go to test 3.

b. If voltage is present and solenoid does not engage starter motor, proceed to step 4.

Step 4. Set multimeter to measure continuity. Check continuity between starter solenoid

ground and frame ground.

a. If continuity is greater than 1 ohm, remove starter (WP 0091 00) and starter motor

ground cables. Replace or repair cables (WP 0125 00) that have resistance greater

than 1 ohm. Clean cable ends. Clean connections on starter motor and frame ground.

Connect ground cables and ensure all connections are tight. Repeat test 1, step 1.

b. If continuity is greater than 1 ohm, starter solenoid is defective. Replace starter

Step 5. Check battery cables for voltage drop (malfunction 3, tests 4 through 7).

Test 3. Test for battery voltage at lead 74B of magnetic starter relay.

Step 1. With accessory/battery switch ON, engage starter switch and, at same time, check for

battery voltage at lead 74B on magnetic starter relay.

a. If 19 Vdc is not present, go to test 4.

b. If voltage is present, go to step 2.

Step 2. Set multimeter to measure continuity. Check continuity of ground lead between

magnetic starter relay and ground on frame.