TM-9-2320-280-20-1

TRUCK, UTILITY: M998 SERIES

TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3

JANUARY 1996

TM-9-2320-280-20-1 - Page 308 of 888

TM 9-2320-280-20-1

REFERENCE INFORMATION

ALTERNATOR

Change 1

2-223

NOTE

For 60 amp Prestolite alternator, go to B,

page 2-204.

For 100 amp Prestolite alternator, go to C,

page 2-208.

For 200 amp Prestolite alternator, go to D,

page 2-212.

For 200 amp single voltage Niehoff

alternator, continue with E.

For 100 amp single voltage Niehoff

alternator, continue with F.

For 100 amp dual voltage Niehoff

alternator, go to F.1, page 2-224.2.

For 200 amp dual voltage Niehoff

alternator, go to G, page 2-224.6.

For 400 amp dual voltage Niehoff

alternator, go to H, page 2-224.10.

NOTE

The regulator for this model alternator has

overvoltage protection. Any output voltage

over 30.5 volts is an overvoltage.

Output voltage of 25-30.5 is acceptable for

this alternator.

1. Start Test 10, Engine RPM.

2. Crank or start the engine. Displayed

reading is RPM. Engine RPM should

be 1200 - 1500.

ENGINE RPM

STE/ICE-R TEST 10

1. Connect RED clip to the indicated

test point, BLACK clip to negative or

ground.

2. Start Test 89, DC Volts.

3. Displayed reading is in volts.

0-45 DC VOLTS

STE/ICE-R TEST 89

NOTE

Voltage on wire 568 signals regulator to

turn on. Without voltage, regulator can’t

operate. Wire 568A is connected with wire

5A inside engine wire harness. If there is

no loose end on wire 568A, wire harness

repair is required.