VXSCAN EM285 Automotive Electric Circuit Tester with Test Light, Circuit Detector with Cable, Auto Short Tester, Voltage Polarity Tester, Car Electrical Test Tool for 6-24V DC Vehicle

Portable and ergonomic design

High-sensitivity test light tip, Two clamps with strong bite force, LED test lights and buzzer warnings, easy use power switch.

Wide range applications

Not just for car! Works on 6-24v DC automotive electrical systems.

Our circuit tester is a high cost and performance ratio product.

Free extension cable

The cable length of this circuit tester is about 16ft which allows you test any electrical system easily.

Quick self-test

Hook-up: unroll the unit’s cable.

Clamp the red clip to the positive terminal of the vehicle’s battery, clamp the black clip to the negative terminal of the vehicle’s battery.

Press the front part(-) of the power switch, the LED indicator should light RED.

Press the rear part (=), the LED indicator should light GREEN. The unit is now ready to use.

If the LED indicator did not light, the cause may be that the clip connections are not good or the unit is damaged.

Polarity testing

Contacting the probe’s tip to a positive(+) circuit will light the LED indicator RED. Contacting the probe’s to a negative(-) circuit will light the LED indicator GREEN. Contacting the probe’s tip to an open circuit will be indicated by that the LED indicator is off.

Continuity testing

By using the probe tip together with the auxiliary ground lead, continuity can be tested on wires and components which are disconnected from the vehicle’s electrical system. When continuity is present, the LED indicator will light GREEN.

Note: Don not press the power switch

Testing trailer lamps and connections

Connect the unit to a good battery.

Clip the clip of the auxiliary ground lead to the trailer ground

Probe the contacts at the jack while pressing the power switch’s front part(-). This lets you check the function and orientation of the trailer lamps.

Jumper lead feature

The black clip and the auxiliary ground lead are connected directly through the unit.

By leaving the red clip disconnected from the vehicle’s battery, the unit can be used as a long jumper lead.

Be careful to avoid short circuits and overloading when using this jumper function. In this configuration, the leads are not protected by the unit’s circuit breaker.

Checking for bad ground contacts

Probe the suspected ground wire or contact with the probe tip.

Observe the green LED indicator.

Press the power swithc"s front part(" - ")then release.

If the LED indicator changed from GREEN to RED, this is not a true ground.

If the unit sounds, this circuit is more than likely a direct ground. Keep in mind that high current components such as starter motors will also cause the unit to sound.