Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics and Interior Lights Schematics | |||
1 | Did you review Blackout (B/O) Lighting Description and Operation? | Go to Step 2 | |
2 | Verify that the marker lamps are inoperative. Do the marker lamps operate normally? | Go to Testing for Electrical Intermittents in Wiring Systems in 2005 C/K Truck Service Manual | Go to Step 3 |
3 | Are all marker lamps inoperative? | Go to Step 4 | Go to Step 8 |
4 | Inspect the fuse(s), check for corroded inline connectors, check for broken or partially broken wires inside insulation, and for properly installed aftermarket equipment. Did you find the condition? | Go to Step 5 | Go to Step 6 |
5 | Make necessary repairs. Did you complete the repairs? | Go to Step 14 | -- |
6 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 14 |
7 | Connect a test lamp between inline fuse cavity B circuit 911 (PK) wire and ground. Does the test lamp illuminate? | Go to Step 11 | Go to Step 10 |
8 | Test the supply circuit of the inoperative lamp for high resistance, or an open. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems in 2005 C/K Truck Service Manual. Did you find and correct the condition? | Go to Step 18 | Go to Step 9 |
9 | Test the ground circuit of the inoperative lamp for high resistance, or an open. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems in 2005 C/K Truck Service Manual. Did you find and correct the condition? | Go to Step 18 | Go to Step 12 |
10 | Locate and repair an open in circuit 911 (PK) wire between inline fuse B and blackout (B/O) service drive switch. Did you complete the repair? | Go to Step 18 | ___ |
11 | Disconnect the blackout (B/O) marker lamp(s) and connect a test lamp between cavity A circuit 900 (BN/WH) front and circuit 900 (BN/WH) rear to ground. Does the test lamp illuminate? | Go to Step 12 | Go to Step 13 |
12 | Replace blackout (B/O) marker lamp(s) assembly. Did you complete the replacement? | Go to Step 18 | ___ |
13 | Locate and repair an open in circuit 900 (BN/WH) front and circuit 900 (BN/WH) rear wire between inline fuse and blackout (B/O) marker lamp assembly. Did you complete the repair? | Go to Step 18 | ___ |
14 | Connect a test lamp between the blackout (B/O) service switch to circuit 40 (OG) cavity B and ground. Does the test lamp illuminate? | Go to Step 15 | Go to Step 16 |
15 | Replace the blackout (B/O) service switch. Refer to Blackout Lamp Switch Replacement . Did you complete the replacement? | Go to Step 18 | ___ |
16 | Connect a test lamp at I/P relay block connector C8 cavity C circuit 40 (OG) wire and ground. Does the test lamp illuminate? | Go to Step 17 | Go to Electrical Center Identification Views in Wiring Systems |
17 | Locate and repair open in circuit 40 (OG) wire between I/P relay block connector C8 cavity C and the blackout (B/O) service switch. Did you complete the repair? | Go to Step 18 | ___ |
18 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
