TM-9-2320-365-20-1

M1078 SERIES, 2 1/2-TON, 4 X 4, LIGHT MEDIUM TACTICAL VEHICLES (LMTV)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; UNIT MAINTENANCE; VOLUME NO. 1 OF 5

FEBRUARY 2006

CHANGE 3

TM-9-2320-365-20-1 - Page 1440 of 1760

KNOWN INFO

TEST OPTIONS

REASON FOR QUESTION

WARNING

Read WARNING

on following page.

e89. ELECTRICAL SYSTEM DOES NOT MAINTAIN A CHARGE (CONT)

Voltage Test or

STE/ICE-R Test #89

8.

Engine oil pressure indicator

light illuminates.

OIL PRESS gage operates.

Engine starts.

Alternator belts OK.

Battery(ies) OK.

Engine oil pressure switch OK.

Relay K11 OK.

Dashboard cable assembly OK.

Engine control cable assembly

OK.

Alternator ground strap OK.

100 AMP alternator to reverse

polarity relay 12 vdc cable OK.

200 AMP alternator to terminal

block 12 VDC cable OK.

100 AMP alternator to reverse

polarity relay 24 VDC cable

OK.

200 AMP alternator to terminal

block 24 VDC cable OK.

Faulty alternator.

Faulty voltage regulator.

POSSIBLE PROBLEMS

Is the alternator output

within normal voltage range

for both 12 VDC and 24

VDC terminal studs with

a known good voltage

regulator?

TM 9-2320-365-20-1

2-1016.8

Change 1

With a known good voltage

regulator installed; if the

voltage regulator output is not

within normal range, the

alternator is faulty.

If the

voltage regulator output is

within normal range, the

previous voltage regulator is

faulty.

YES

NO

Replace 100 AMP alternator (para 7-2)

or 200 AMP alternator (para 20-56).

Replace 100 AMP voltage regulator

(para 7-5) or 200 AMP voltage

regulator (para 20-57).