TM 9-2350-247-20-1
M3 HEATER DOES NOT WORK (M548A3)—Continued
0104 00
DY
1. Turn NBC AIR FILTER SWITCH (1) OFF (see your -10).
2. Turn MASTER SWITCH OFF.
3. Connect NBC wiring harness connector P1 to M3 heater wiring
harness connector.
4. Measure voltage between circuit lead 135G (1) to ground and
circuit 537 (2) to ground on relay (3).
5. Turn MASTER SWITCH ON.
6. Turn NBC AIR FILTER SWITCH (1) ON (see your -10).
7. Does multimeter read 17 or more volts?
YES
NO
GO TO EY (PAGE 0104 00-6)
2DY
1. Repair wiring harness (WP 0294 00).
2. Verify no faults found.
0104 00-5
