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 TM 55-1905-222-14
MAINTENANCE OF ALTERNATOR
3-5 FUNCTIONALI TEST OF ALTERNA'TOR
INITIAL SETUP
Tools:
General Safety Instructions:
Tool Kit, Mechanic's, Rall
and Marine
Do NOT under any circumstances, short FIELD
5 180-00-629-9783
terminal of alternator to ground.
Multimeter (TS-352B/U or equiv)
Do NOT disconnect voltage regulator while alter-
Multimeter Jumper leads 2, 4, 6, and 10
nator Is operating.
feet in length with alligator clips
Tester, Battery
Do NOT disconnect alternator output lead from
alternator while the alternator is operating
Equipment Conditions
Do NOT remove alternator without first discon-
necting the negative battery cable from the bat-
Refer to NOTES in procedure.
tery.
NOTE
o
Before actual in-vessel testing begins, check the battery to be sure it is fully charged (Normal 1.260 -
1.285 Sp. Gr.), if not, charge the battery first.
o
Check that wires and cables are free of corrosion.
o
The alternator drive belt must be properly adjusted, in good condition, and free of grease or oils that
may induce slipping under load.
1. SETUP MULTIMETER
a.
Hold multimeter in hand. Switch to 0-40
volts dc range
b.
Connect negative multimeter lead to nega-
tive battery terminal.
2. BATTERY VOLTAGE AND SHORTED
POSITIVE DIODE TEST
NOTE
The engine should not be running when performing this test.
Change 2 3-23
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