TEST OR INSPECTION
Remove rings, wristwatches, neck chains, and any other jewelry before working
around vehicle. Jewelry can catch on equipment and cause serious injury. Jewelry
and tools may short across electrical circuits and cause damage to equipment, or
severe burns or electrical shock to personnel.
Shut vehicle engine off (TM 9-2320-347-10). Turn battery disconnect switch to OFF
position (WP 0007). Cut white wire at crew cab heater control valve butt splice
connector. Turn battery disconnect switch to ON position (WP 0007). Put crew cab air
conditioner/heater control panel switch to on position (WP 0008). While an assistant
puts crew cab air conditioner/heater control panel set point to 80ºF (26ºC) (WP 0009),
check for 22 to 28 VDC at crew cab heater control valve white wire butt splice connector
termination to a known good ground.
If 22 to 28 VDC are not present, go to Step 34.