TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download
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TM 9-2350-247-20-1 COOLANT HEATER MALFUNCTIONS—Continued 0086 00 2DY 1. Measure resistance between lead ends from ON/OFF/START switch terminals 21 (1) and 14 (2). 2. Does multimeter read 0 ohms? YES NO 2DYN 1. Repair heater switch jumper lead between terminal 21 and 14 (WP 0294 00). 2. Verify no faults found. 3DY 1. Replace heater ON/OFF/START switch (WP 0472 00). 2. Verify no faults found. EY 1. Remove heater harness plug (1) from heater control jack (2). 2. Measure voltage between heater control jack (2) pin A (3) and ground with HEATER switch onSTART. 3. Does multimeter read more than 17 volts? YES NO GO TO FY (PAGE 0086 00-7) 0086 00-6