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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 628 (Lighting Systems) >> Description and Operation >> Exterior Lighting Systems Description & Operation >> Backup Lamps

Backup Lamps

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The B/U LP 25 A fuse in the engine wiring harness junction block supplies battery positive voltage to the normally open backup lamp switch. When driver places the gear selector lever is in the REVERSE position, the backup lamp switch closes and the current flow is from the backup lamp switch through the VEH B/U 15 A fuse to the backup lamps. The backup lamps are grounded at G401.

For trailer wiring, a separate backup lamp circuit is connected through the engine wiring harness junction block from the TRLR B/U 10A fuse to the trailer wiring harness.

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