Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics | |||
1 | Did you review the exterior lighting operation and perform the necessary inspections? | Go to Step 2 | |
2 | Place the marker lamp switch in the ON position. Do the marker lamps illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 14 |
4 | Connect a fused jumper wire between the marker lamp relay switch side voltage input circuit and switch side voltage output circuit. Do the marker lamps illuminate? | Go to Step 6 | Go to Step 5 |
5 | Does the fuse in the jumper wire open? | Go to Step 15 | Go to Step 11 |
6 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 8 |
7 | Connect a test lamp between the marker lamp relay coil side control circuit and the coil side ground circuit. Does the test lamp illuminate? | Go to Step 12 | Go to Step 16 |
8 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 17 |
9 |
Does the test lamp illuminate? | Go to Step 13 | Go to Step 10 |
10 | Does the fuse in the jumper wire open? | Go to Step 18 | Go to Step 19 |
11 |
Does the test lamp illuminate? | Go to Step 20 | Go to Step 21 |
12 | Inspect for poor connections at the marker lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 24 | Go to Step 22 |
13 | Inspect for poor connections at the marker lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 24 | Go to Step 23 |
14 | Repair an open or short to ground in the marker lamp relay switch side voltage input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
15 | Repair a short to ground in the marker lamp relay switch side voltage output circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
16 | Repair an open in the marker lamp relay coil side ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
17 | Repair an open in the marker lamp switch's switch side voltage input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
18 | Repair a short to ground in the marker lamp relay switch side voltage output circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
19 | Repair an open in the marker lamp relay switch side voltage output circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
20 | Repair an open in the marker lamps ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
21 | Repair an open in the marker lamps voltage supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 24 | -- |
22 | Replace the marker lamp relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 24 | -- |
23 | Replace the marker lamp switch. Refer to Trailer Marker Lamp Switch Replacement . Did you complete the replacement? | Go to Step 24 | -- |
24 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
