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. Self-check: connect the alligator clip to the vehicle's negative (-) battery terminal and touch the positive (+) battery terminal with testing probe. If the test light glows, the bulb is working. If not, please replace the bulb.
  2. Turn on the power of the component that is to be checked.
  3. Attach to the ground (usually the vehicle's frame or at the point where the negative battery cable ends) with alligator clip.
  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 or not reaching the circuit.
  6. Repair any wiring insulation damage that is caused by piercing with electrical tape or silicone.