16536-24V Heavy Duty Circuit Tester


Check on 6 and 24V systems. Use on fuses, test connections and find short circuits quickly and easily. Available for checking on lights, starters, alternators, cooling and heating components, radios and relays.


  • Replaceable bulb.
  • Cord remains flexible in low temperatures.
  • Probe length: Approximately 80mm / 3.15"
  • Illuminating handle indicates the circuit is active.
  • Heavy duty alligator clip with PVC cover for solid grounding.
  • Sharp steel probe easily pierces insulation jacket to check circuit.


VOLTAGE RANGE 6-24V                       
PROBE 80mm / 3.15"
  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 or power is not reaching the circuit.
  6. Repair any wiring insulation damage caused by piercing with electrical tape or silicone.