ARMY TM 9-6115-670-14&P 4-11 1. ENGINE FAILS TO TURN OVER. STEP 1. Check for adequate voltage from vehicle to generator set. a.  If there is low or no voltage from vehicle to generator set, check DC meter in shelter/vehicle.  If low or no voltage still exists, troubleshoot vehicle batteries and electrical wiring between generator set and vehicle batteries (see system TM).  If low or no voltage still exists, charge or replace vehicle battery. b.  If there is adequate voltage to generator set, proceed to step 2. STEP 2. Check for loose or corroded battery cables, terminals and posts. a.  If battery cables, terminals and posts are corroded, clean and tighten. b.  If battery cables are clean, proceed to step 3. STEP 3. Test for defective MASTER ON/OFF switch. a.  If the MASTER ON-OFF switch is defective, replace switch. b.  If the MASTER ON-OFF switch is functioning properly, proceed to step 4. STEP 4. Test for defective ENGINE START switch. a.  If the ENGINE START switch is defective, replace switch. b.  If the ENGINE START switch is functioning properly, proceed to step 5. STEP 5. Test for defective EMERGENCY STOP switch. a.  If the EMERGENCY STOP switch is defective, replace switch. b.  If the EMERGENCY STOP switch is functioning properly, proceed to step 6. STEP 6. Test for defective starter (para 4.37.). a.  If the EMERGENCY STOP switch is defective, replace switch. b.  If the EMERGENCY STOP switch is functioning properly, notify next higher level of maintenance.