Polarity test

The AUTOOL BT160 Circuit Tester can test for uncertain contact polarity in vehicle circuit system.

Test Procedure.
Unroll the unit’s cable and connect the red clip to the positive end of the vehicle battery and the black clip to the negative end of the vehicle battery; connect the probe tip to the positive (+) end and the LED should glow red; connect the probe tip to the negative (-) end and the LED should glow green.

Caution: Do not operate the unit in areas with combustible gases, dust, or explosive atmospheres; do not allow for use with AC power and DC circuits exceeding 24V.

Short circuit tracking and location

In most cases, a short circuit of a component or a momentary overload will cause a fuse or circuit to blow and a circuit breaker to trip. The AUTOOL BT160 circuit tester can search and locate the cause of a short circuit where it occurs.

Test Procedure:
Connect the red clip to the positive end of the vehicle battery and the black clip to the negative end of the vehicle battery; press the button to the “-” side, the LED should glow red and provide positive voltage. Remove the blown fuse from the fuse box and trace from the two terminals of the fuse socket. If the LED glows green and the buzzer sounds, it indicates a short circuit or overload component on this side, please note the color or identification code of this wire. Follow the wires along the harness as far as possible, find the color-coded wire in the harness and expose it, then cut the wire. Follow the direction of the shorted wire and repeat the process until you find the short.