TM 5-3805-262-203-32. CHARGING SYSTEM TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. ALTERNATOR NOT CHARGING BATTERIES (Cont).S t e p 1 . ( C o n t ).a. If VTMpanelsdisplays 26.5 to 31 volts, go to page 3-77, instrumenttroubleshooting, MALFUNCTION 6.b. If voltage is less than 26.5 volts, go toc. If voltage is more than 31 volts, replace5-10).step 2 below.a l t e r n a t o r ( p a geStep 2.Connect test probe cable W2 connector P1 to VTM J4.Dial 01 into VTM TEST SELECT and press and release TEST.When PASS appears on VTM display, dial 89 into TEST SELECT.Connect test probe cable W2 red test clip to black test clip.Press and hold TEST until CAL appears on display then release TEST.Wait for offset value to appear on display. Offset value should bebetween -6.8 to +6.8. If it is not, STE/ICE is defective (refer toTM 9-4910-571-12&P).Alternator BAT terminal is connected to battery positive post. Be care-ful when connecting test clip to alternator BAT terminal. If you acci-d e n t l y s h o r t B A T t e r m i n a l t o m e t a l p a r t o f a l t e r n a t o r , b a t t e r i e s c o u lde x p l o d e c a u s i n g d e a t h o r s e r i o usi n j u r y t o p e r s o n n e l s t a n d i n g n e a rb a t t e r i e s .Connect test probe cable W2 redtest clip to alternator BATterminal and black test clip toloader or alternator frame.Start engine and depress accel-erator to obtain 1700 to 1900rpm. VTM will alternately dis-play engine rpm and batteryv o l t a g e.Turn all loader driving lamps,flood lights, and accessorieson to load charging system.VTM display should indicate26 . 5 to 31 volts.3-257
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