ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
COLD WEATHER SYSTEM
WARNING
Electrical hazard. After restoring power to the heater to conduct the test, be
extremely careful not to let any part of your person touch the spark plug, bare
wires, leads, or terminals. Failure to observe this warning may result in serious
injury or death from electrical shock.
f. Plug in the heater power cord.
g. If the motor starts, allow it to reach operating speed, then remove the jumper from the
right terminal (2) of the relay. The motor should continue to run.
3. If the motor starts and continues to run, the relay is bad. Replace the relay as described below.
4. If the motor does not start, check your test procedures to make sure the test was performed
properly.
5. If the test was performed properly and the motor failed to start, the motor is bad. Replace the
motor and pump assembly as described below.
BLACK MOTOR WIRE
BRACKET
SCREW
TERMINAL 1
RELAY
TERMINAL 2
JUMPER
TERMINAL 3
Figure 5. Diesel Heater Motor Relay and Motor Test Set-Up.
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