Table 1. Air Dryer Heater Circuit Troubleshooting Procedures.

TM 9-2320-303-24-1

Table 1. Air Dryer Heater Circuit Troubleshooting Procedures.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Air Dryer Heater Not Operating.

1. Check reservoir heater/power If defective, replace 15A fuse (WP

take-off 15A fuse.

2. Remove reservoir heater/ If +12 VDC is present, go to step

power take-off 15A fuse. 3. If no voltage is present, repair

Check for +12 VDC at lead 18 lead 18 to ignition run power bus.

fuse connector.

3. Disconnect lead 94 from air If +12 VDC is present, go to step

dryer drain valve heater. Check 4. If no voltage is present, repair

for +12 VDC at lead 94.

lead 94.

4. Disconnect ground lead from

If continuity is indicated, replace

air dryer drain valve heater.

air dryer drain valve heater (WP

Check for continuity between

0262 00). If no continuity is

lead and ground.

indicated, repair ground lead.