16496-12V Heavy Duty Circuit Tester


Check on 6 and 12V systems. Quickly and safely tests high and low voltages on all vehicle voltages, including computerized engine.


  • Heavy duty insulated ground clip.
  • Probe Length: Approximately 90mm / 3.5"
  • 5-feet tough flexible rubber cable with spring relief.


VOLTAGE RANGE 6-12V                         
PROBE 90mm / 3.5"
  1. Check the bulb by clamping the alligator clip to the vehicle's negative (-) battery terminal and touching the test probe to the positive (+) battery terminal.  If the test light glows, the bulb is working.  If not, replace the bulb.
  2. Turn the power ON to the component that is to be checked. (The ignition may need to be in the ON or ACCESSORY position).
  3. Attach the alligator clip to a good ground (usually the vehicle's frame or at the point where the negative battery cable ends).
  4. Complete the test by touching the component with the probe or by piercing the insulation of the component's wiring.
  5. If the tester light does not glow, then either the circuit is faulty of power is not reaching the circuit.
  6. Repair any wiring insulation damage caused by piercing with electrical tape or silicone.