W 350 Pickup V8-360 5.9L VIN I (1986)
Power Window Relay: Testing and Inspection
Locate the window lift relay and test as follows:
1. Check for a constant power source at the LG wire.
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If power is present, go to step 2.
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If power is not present, check the circuit breaker and connecting wires.
2. Check for ground at the BK wire.
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If a ground is present, go to step 3.
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If a good ground is not present, check for an open in the BK wire to ground.
3. Check for a power source at the DB wire when the key is turned to the "run" position.
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If power is present, go to step 4.
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If power is not present, check for an open in the DB wire from the ignition switch or a defective ignition feed fuse.
4. Check for power at the TN wire.
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If power is present, the relay is operating properly.
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If power is not present, replace the relay.
