LEFT BLACKOUT BRAKE LIGHT WILL NOT LIGHT.

5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

68. LEFT BLACKOUT BRAKE LIGHT WILL NOT LIGHT.

NOTE

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)

and ground.

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 6.

Step 4. Disconnect connector Y (9) and check for +24 VDC between wire 47 (8)

and ground.

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

(page 4-190).

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).