TM 9-2350-311-20-1
AIR CLEANER BLOWER MOTOR CIRCUIT
NOTE
Although air cleaner blower motor circuit differs slightly between M109A2, M109A3,
M109A4, and M109A5 Howitzers, the following troubleshooting procedure applies to
ail vehicles.
The air cleaner blower motor system consists of the blower motor, the air cleaner blower motor relay, air cleaner
generator system relay switch, neutral safety switch, circuit breakers, and associated wiring. The relationship of these
components is shown in the diagram below.
When the MASTER switch is turned ON, 24 Vdc is supplied to the air cleaner blower motors, MASTER relay, and circuit
breakers. The 24 Vdc from the circuit breaker goes to the air cleaner blower motors This allows the air cleaner blower
motor to be energized.
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