Table 3-5. Troubleshooting (Cont)
Test or Inspection
ELECTRICAL SYSTEM (CONT)
68. LEFT BLACKOUT BRAKE LIGHT WILL NOT LIGHT.
Vehicle MASTER disconnect switch must be ON and master light switch set to BO
DRIVE. Failure to do so will cause erroneous results.
Refer to wiring diagram (page 3-209) for all wiring repair steps.
Step 1. Remove two screws (1), two washers (2), and guard (3). Loosen six screws
(4) and remove retainer (5).
Step 2. Remove left blackout brake lamp (6) and check for continuity.
If there is no continuity, replace lamp.
If there is continuity, go to step 3.
Step 3. Disconnect connector B (7) and check for +24 VDC between wire 47 (8)
If +24 VDC is present, reconnect connector B and go to step 4.
If +24 VDC is not present, reconnect connector B and go to
Step 4. Disconnect connector Y (9) and check for +24 VDC between wire 47 (8)
If +24 VDC is not present, repair wiring 47 between
connector Y and connector B.
If +24 VDC is present, reconnect connector Y and go to step 5.
Step 5. Check for +24 VDC between wire 47 (8) and ground at left blackout brake
light connector (10).
If +24 VDC is not present, repair wiring 47 between left
blackout brake light connector and connector Y.
If +24 VDC is present, replace rear composite stoplight/taillight
Step 6. Loosen two captive screws (11) and pull bracket (12) out enough to gain
access to area behind bracket.
Step 7. Remove two clamps (13) and pipe assembly (14).