TM 5-4310-389-14
4.
Refer to paragraph 3-45 (1) for condensate drain solenoid test.
f.
Condensate Heater Switch.
1.
Isolate switch.
2.
Check for continuity in ON position. Open circuit in OFF position.
g.
Engine Oil Pressure Gauge Switch.
1.
Disconnect battery.
2.
Check continuity between wire 10 to engine oil pressure gauge switch and ground.
3.
Multimeter should read open circuit while pressing engine oil pressure gauge switch button.
h.
Engine Head Temperature Gauge Switch.
1.
Disconnect battery.
2.
Check continuity between engine head temperature gauge switch wire 10 and ground.
3.
Multimeter should read open circuit while pressing engine oil pressure gauge switch button.
i.
Compressor Oil Safety Switch.
If inspection verifies a bad compressor oil safety switch, notify Direct Support Level maintenance.
j.
Hourmeter and Ammeter.
Hourmeter.
1.
Compressor unit operating.
2.
Check for voltage at hourmeter terminal.
3.
If voltage is present, hourmeter is defective.
Ammeter.
1.
Isolate ammeter.
2.
Check for continuity between the two terminals.
3-89
