Table 4-3. Organizational Troubleshooting Table - Continued
TEST OR INSPECTION
ELECTRICAL SYSTEM (Cont)
6. ALL 110-VOLT DOME LAMPS DO NOT LIGHT BUT 110-VOLTS AC IS PRESENT AT WALL
Step 1. Check for improperly positioned or defective dome light switch.
If dome light switch properly positioned, proceed to step 2.
Step 2. Check for tripped dome light circuit breaker.
Place dome light circuit breaker in ON position.
7. 110-VOLTS AC NOT PRESENT AT WALL RECEPTACLES BUT 110-VOLT DOME LAMPS LIGHT.
Check for tripped wall receptacle circuit breaker.
Place wall receptacle circuit breaker in ON position.
8. DIM OR FLICKERING LIGHTS.
Step 1. Check for loose, dirty or corroded terminals.
Clean and tighten terminals.
If clean and tight, proceed to step 2.
Step 2. Check ground cables for poor or loose ground.
Clean and tighten terminals on all short ground cables.
1. BRAKES WILL NOT RELEASE.
Step 1. Check for defective emergency relay valve.
Build up pressure in semitrailer brake system if semitrailer is coupled. Open drain cock
on semitrailer air reservoir if semitrailer is uncoupled. Refer to para. 4-39g.
If emergency relay valve operating, proceed to step 2.
Step 2. Check intervehicular air hose connections to towing vehicle.
Connect intervehicular air hoses properly.
If air hoses are connected properly, proceed to step 3.
Step 3. Check position of brake valve on towing vehicle.
Move brake valve to release position.
If brake valve is correctly positioned, proceed to step 4.
Step 4. Check for restriction in service air and emergency air lines.
If air lines or hoses are restricted, replace or repair as required. Refer to para. 4-39d.
If air lines or hoses are free of restriction, proceed to step 5.