If the probe touches the negative circuit, the display will light up green, the screen will show 0v, and the device will sound a beep. If the display lights up green and a tone sounds, you have verified that the wire is shorted.

Supported System: ABS
Brand: jdiag
Type: Battery circuit testing
Warranty: 1 Year
Vehicle Type: Heavy Duty/Commercial, Motorcycle, Passenger Vehicle
OBD Interface: CAN, OBD, OBDII
Country/Region of Manufacture: China
Volt: 6-30V
Features: Digital Display, Voltmeter