TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 279 of 1275
TM 9-2350-311-20-1 CONTINUED FROM STEP M NOTE Perform step M ONLY if vehicle is equipped with adjustable regulator. If not, replace voltage regulator (para 8-3). Do not check or adjust voltage regulator except as follows: 1. 2. 3. 4. 5. 6. Make sure batteries are fully charged while checking and/or adjusting regulator (TM 9-2350-311 -10). Connect red lead of multimeter to positive battery cable terminal and black lead to negative battery cable terminal. Start engine and run at approximately 1000 rpm. Run engine as required to bring engine compartment, regulator, and batteries to normal operating temperature. During above warm-up period, increase engine speed to approximately 2500 rpm and then return to idle speed (750 rpm) while observing multimeter. 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. Multimeter needle may vary slightly, but should return to its original voltage quickly. Turn off all major vehicle electrical components and turn on vehicle headlights. 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 3-179