This OTC Tools test switch attaches between the negative battery cable and the battery so a technician can connect a digital amp meter and pull fuses one at a time to track down a parasitic draw that's killing a customer's battery.

OTC Tools 6945 Parasitic Draw Test Switch Features:

• Isolates Parasitic Amperage Draws
• Works on Any Vehicle with a Side- or Top-Post Battery
• Attaches Between the Negative Battery Cable and Battery
• For Use with a Digital Amp Meter
• Sold Individually