ARMY TM 9-6115-673-13&P
AIR FORCE TO 35C2-3-512-1
(9) Connect positive lead of multimeter to terminal 7 of TB1 and negative lead to terminal 1 of
TB1. Multimeter should indicate 0-2 VDC with ON-OFF load circuit breaker CB1 in OFF position.
With CB1 in ON position, multimeter should indicate 35-45 VDC.
(10) Apply a ground to LOP switch terminal. Diesel engine should stop.
CAUTION
The following steps are the only way to check the short circuit function of
the generator control unit without special test equipment. If the ON-OFF
load circuit breaker closes and does not open instantaneously,
IMMEDIATELY open it manually. Electrical circuitry and component
damage could occur in less than a second if short circuit function is
inoperative.
(11) With diesel engine stopped, connect a piece of 18 AWG electrical wire across output load
terminals. Loop wire so as to avoid contact with the generator set frame.
(12) Start diesel engine and attempt to close ON-OFF load circuit breaker. The circuit breaker
should open instantaneously.
(13) Shutdown engine and remove cable from output load terminals.
(14) Replace generator control unit if any of the above readings are not as stated.
(15) Close and secure instrument panel.
c. Testing (MEP-501A).
(1) Shut down generator set.
(2) Release instrument panel by turning fastener, open instrument panel slowly.
WARNING
High voltage is produced when this generator set is in operation. Use care
when working around an open control panel with the generator set
operating. Improper operation and/or failure to follow this warning could
result in personal injury or death by electrocution.
(3) Start generator set.
(4) Set multimeter to AC volts and connect positive lead of multimeter to terminal 6 on terminal
board TB1 and negative lead to terminal 7 of TB1. Multimeter should indicate 40-50 VAC. If
reading is incorrect, check diesel engine dynamo (G1) and wiring between dynamo and TB1.
Then redo step 4.
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