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EXCITER COVER
FIVE SCREWS
(TWO ON OTHER SIDE)
FIGURE F.11 – EXCITER COVER SCREW
LOCATIONS
FLASHING VOLTAGE TEST
(Engine not running) (continued)
PROCEDURE
1. Open either, or both of the doors on the control
panel end of the SAE-400 machine.
WARNING: Secure the doors in the open position
using the door restraint system. If the
machine does not have a door restraint
system, remove the doors or securely
restrain them to prevent them from falling
closed.
2. Remove the covers from the exciter/auxiliary power
alternator by removing the screws. See Figure F.11.
3. Make sure that the battery is fully charged and in
good condition, and the battery connections are
clean and tight.
4. Connect the volt meter probes to the brush termi-
nals. See the wiring diagram and Figure F.12.
5. Set the RUN/STOP switch to “RUN”. Do not start
the engine at this time.
6. Within 30 seconds of switching the run/stop switch
to the run position, read the “flashing” voltage
across the brush connections. The meter should
read approximately 2 to 4 VDC.
NOTE: If the flashing voltage reading is not taken with-
in 30 seconds, (60 seconds with some models)
after moving the run/stop switch to the run posi-
tion, move the run/stop to “stop” then back to
“run”. This resets the Idler/engine protection
PC board.
TROUBLESHOOTING AND REPAIR
F-38 F-38
SAE-400 SEVERE DUTY
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POSITIVE
SLIP RING
NEGATIVE
SLIP RING
BRUSH HOLDER ASSEMBL
Y
BRUSHES
VOLTMETER LEADS
FIGURE F.12 – FLASHING VOLTAGE TEST