TM-9-2350-358-BD

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6

TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE

MARCH 1994

TM-9-2350-358-BD - Page 175 of 343

TM 9-2350-358-BD

7-12.

RELAY, MASTER - CONTINUED

NOTE

While the cables from terminals A1 and A2 of the master relay are

connected, the electrical circuits of the M109A6 are hot.

When the

M109A6 is inoperative and the MASTER power switch would

normally be set to OFF, the cables should be disconnected (steps 2

and 3) to avoid possible battery discharge.

4.

Using bolt, washers, lockwasher and nut, connect cables taken from terminals A1 and A2.

5.

Insulate and secure cables from A1 and A2 while connected, using electrical insulating tape.

6.

Connect battery ground cable to shunt.

7.

Record BDAR action taken.

When mission is complete, as soon as practical, repair the equipment/system using

standard maintenance procedures.

7-13.

RELAY, STARTER PROTECTION

General Information:

The starter protection relay prevents damage to starter from cranking beyond a predetermined time limit and therefore

overheating.

Limitations:

Logic circuit is disabled and cannot utilize sensing signals from the generator or voltage regulator.

Personnel/Time Required:

•

2 soldiers

•

0.5 hour

Materials/Tools:

Wire, electrical (item 74, Appendix C)

References:

TM 9-2350-314-20-1-2

7-15