1.Insufficient Clamping Force:Signs: Fails to grip battery terminals tightly; detaches with a light pull.Risks: Poor contact leads to inaccurate voltage readings and intermittent connections, resulting in costly misdiagnosis of electrical issues.
2.Cracked or Melted Insulation:Signs: Cracks, chips, or deformation on plastic/rubber handles (often caused by overheating).Risks: Exposed metal parts pose an electric shock hazard (especially in damp conditions) and a high risk of short circuits. Short circuits can blow fuses or even damage your vehicle's ECU—leading to expensive repairs.
3.Severe Corrosion or Oxidation:Signs: White/green corrosion buildup or black discoloration on metal clamp heads. Risks: Corrosion creates a high-resistance layer that blocks current flow, causing voltage drops and severely inaccurate test results. Example: Your battery may read 12.6V, but the corroded clip only delivers 11V to your diagnostic tool—completely misleading your diagnosis.
4.Deformed or Broken Metal Clamp Head:Signs: Bent, broken, or misaligned "alligator teeth" that cannot close properly.Risks: Unable to establish a reliable electrical connection—rendering the clip completely useless. Immediate replacement is mandatory.