TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

  TM-9-2350-311-20-1 - Page 265 of 1275

TM 9-2350-311-20-1
NOTE
Perform step M only if vehicle is equipped with an
adjustable regulator. If not, replace regulator (para 8-3).
CONTINUED FROM STEP L
I
3-3n)
Troubleshoot
air cleaner blower
M
Do not check or adjust voltage regulator except
as follows:
1. Make sure batteries are fully charged while
checking and/or adjusting regulator
(TM 9-2350-311 -10).
2. Connect red lead of multimeters to positive
battery cable terminal and black lead
to negative battery cable terminal.
3. Start engine and run at approximately 1000
rpm. Run engine as required to bring engine
compartment, regulator, and batteries to
normal operating temperature.
4. During above warm-up period, increase
engine speed to approximately 2500 rpm
and then return to idle speed (750 rpm) while
observing multimeters. Voltage reading
should not vary more than ± 0.1 volt during
above check. This also provides a check on
tightness of wiring connection. Turn
headlights on and off several times.
Multimeters
needle may vary slightly, but
should return to its original voltage quickly.
5. Turn off all major vehicle electrical
components and turn on vehicle headlights.
6. Open transmission left access door and
remove square head pipe plug from end of
voltage regulator (between and above
harness connectors).
[
CONTINUED ON NEXT PAGE
3-155
motor circuit (para 3-31, 3-3m, or


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