ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
3. DIM OR FLICKERING LIGHTS.
Check for loose or bad ground.
See malfunction 1, step 5.
Check for loose, dirty, or corroded contacts at:
Intervehicular cable connector.
Front and rear main harness connectors.
Front and rear harness connectors.
Affected light assembly connector.
Affected light assembly lamp socket.
Tighten loose and clean dirty or corroded contacts.
4. BRAKES WILL NOT RELEASE.
Check operation of relay valve (1).
If brake system air pressure is below 60 psi (413.7 kPa), the relay valve will go into emergency bypass and apply
brakes until system pressure increases to 60 psi (413.7 kPa).
Have assistant apply brakes at towing vehicle; then release brakes. Brake chamber air pressure should vent
through relay valve.
Replace relay valve if air does not vent. See page 4-64.