Table 4-3. Unit Troubleshooting (Continued)
TEST OR INSPECTION
AIR RESERVOIRS FAIL TO FILL WITH AIR.
Inspect reservoir and drain valve.
If open, close drain valve.
Inspect parking brake on prime mover.
If engaged, release parking brake.
Inspect gladhands for damage or incorrect coupling.
Disconnect, inspect, and reconnect gladhands.
Inspect air lines and connections for leaks. Feel for escaping air and/or use soapy
water solution to detect leaks.
Repair air lines or connections in accordance with paragraphs 4-58 and 4-59.
Inspect air reservoirs for damage or leaks.
Repair or replace reservoirs in accordance with paragraph 4-54 or 4-55.
When troubleshooting an electrical malfunction or performing electrical
maintenance, ALWAYS disconnect intervehicular electrical cable from towing
vehicle. Failure to do so may result in injury or death due to electrical shock.
ALL LIGHTS ARE INOPERABLE.
Check trailer and gooseneck electrical connectors for dirty, corroded, or damaged
Check prime mover electrical connection at cable receptacle.
Reconnect cable if not properly connected.
If prime mover has no power, consult appropriate TM for troubleshooting.