TM 9-2350-247-20-1
M3 HEATER DOES NOT WORK (M548A3)Continued
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CY
1. Turn NBC AIR FILTER SWITCH (1) OFF (see your -10).
2. Turn MASTER SWITCH OFF.
3. Disconnect NBC wiring harness connector P1 (2) from M3 heater
wiring harness connector (3).
4. Turn MASTER SWITCH ON.
5. Turn NBC AIR FILTER SWITCH (1) ON (see your -10).
6. Measure voltage between any pin of NBC wiring harness
connector P1 (2) except pin H and ground.
7. Does multimeter read 17 or more volts from more than one pin of
NBC wiring harness connector P1 (2)?
YES
NO
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