A technician is diagnosing an intermittent short to ground in a vehicle's tail light circuit. The fuse blows only when the vehicle goes over bumps. Which of the following wiring repair techniques is LEAST likely to resolve this specific issue permanently?
- ACarefully insulating the exposed wire with liquid electrical tape.
- BRerouting the repaired wire away from pinch points.
- CReplacing the entire affected section of wiring harness.
- DUsing a heat-shrink butt connector to splice in a new wire section.
Show answer & explanationAnswer & explanation
Correct answer: A. Carefully insulating the exposed wire with liquid electrical tape.
An intermittent short to ground that occurs over bumps suggests the wire insulation is chafed or damaged, and metal of the wire is contacting the chassis. While liquid electrical tape can provide some insulation, it is generally less durable, less flexible, and less resistant to abrasion and environmental factors than proper automotive-grade wiring insulation or heat-shrink tubing. For a permanent repair, especially in an area subject to movement and vibration, a more robust solution like splicing in new wire with heat-shrink or replacing the harness section is required.
Why the other options are wrong
- B. Rerouting the repaired wire away from pinch points addresses the root cause of the chafing and is crucial for a permanent solution.
- C. Replacing the entire section of harness is a highly effective way to eliminate all potential damage in that section and provides a permanent repair.
- D. Splicing in a new wire section using a properly crimped and heat-shrunk butt connector provides a durable and environmentally sealed repair, suitable for automotive use.
Permanent Wiring Repair
A wiring repair method that ensures long-term electrical integrity, mechanical strength, and environmental protection, often involving proper crimping, soldering (where appropriate), heat-shrink sealing, and proper routing.
- Durable and robust.
- Resistant to vibration and moisture.
- Matches or exceeds OEM standards.
Memory trick: Don't just patch, make it last; a permanent fix beats a quick blast.