TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
Page 198 of 1176
MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 2. STARTER MOTOR OPERATES, BUT ENGINE CRANKS SLOWLY NOTE • If Simplified Test Equipment for Internal Combustible Engine–Reprogrammable (STE/ICE-R) is available, perform NG Starter Circuit Tests. (WP 0018 00). • Hot battery terminal indicates loose or corroded connection. Test 1. Check batteries for overheating by cranking engine for 15 seconds and feeling battery terminal connections. Test 2. Test specific gravity for each battery. Perform a specific gravity test (TM 9-6140-200-14). Batteries must test 1.225 or greater, temperature corrected, and all cells in battery must test within 0.025 points of one another. Test 3. Test starter motor voltage. 1. Set multimeter to voltage range that will measure 24 VDC. 2. Connect multimeter positive lead to positive terminal lug 6 of starter motor, and connect negative lead to terminal lug 5 on end plate of starter motor. 3. Crank engine (TM 9-2320-361-10) and observe cranking voltage on multimeter. Voltage should exceed 19 VDC. Test 4. Test motor-to-solenoid strap voltage drop. 1. Set multimeter to voltage range that will measure tenths of a volt. 2. Connect multimeter negative lead to positive terminal lug 6 of starter motor, and connect multimeter positive lead to starter motor solenoid terminal lug 3. 1. Clean corroded connection to bright metal. 2. Tighten all loose connections at batteries, ground, and starter (WP 0087 00, WP 0088 00 and WP 0126 00). 1. Charge all batteries not meeting requirements (TM 9-6140-200-14) and check specific gravity again. 2. If more than 0.025 point variation still exists between cells in any battery, battery is defective and must be replaced (WP 0127 00). If voltage is less than 19 VDC, clean and tighten starter motor connections (WP 0088 00). TM 9-2320-361-24-1 0012 00 0012 00-14 BATTERY AND CHARGING SYSTEM TROUBLESHOOTING (Contd) Table 2. Starting System Troubleshooting Procedure (Contd).