T a b l e 4-2.
O r g a n i z a t i o n a l Troubleshooting Table - continued
TEST OR INSPECTION
ALL 110 VOLT DOME LAMPS DO NOT LIGHT BUT 110 VOLTS AC IS PRESENT AT WALL
Check for improperly positioned or defective dome light switch.
If dome light switch properly positioned, go to step 2.
Place dome light circuit breaker in ON position.
110 VOLTS AC NOT PRESENT AT WALL RECEPTACLES BUT 110 VOLT DOME LAMPS LIGHT.
Place wall receptacle circuit breaker in ON position.
DIM OR FLICKERING LIGHTS.
Check for loose, dirty or corroded terminals.
Clean and tighten terminals if loose, dirty or corroded.
If clean and tight, go to step 2.
Check ground cables for poor or loose ground.
Clean and tighten terminals on all short ground cables.
BRAKES WILL NOT RELEASE.
Check for defective emergency relay valve.
Build up pressure in semitrailer brake system if semitrailer is
semitrailer is uncoupled.
If emergency relay valve operating, go to step 2.
Check intervehicular air hose connections to towing vehicle.
Connect intervehicular air hoses properly.
If air hoses are connected properly, go to step 3.
Check position of brake valve on towing vehicle.
Move brake valve to release position.
If brake valve is correctly positioned, go to step 4.
Check for restriction in service air and emergency air lines.
If air lines or hoses are restricted, replace or repair as
If air lines or hoses are free of restriction, go to step 5.