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5 & 4 Pin Harness Checker

PN: HC4-5
Additional Resources

None available

Product Applications:

  • Quickly test the tow vehicle’s wiring harness
  • For use on: 4 and 5 pin trailer connectors

Product Description:

The Harness Checker allows the driver or mechanic to quickly test the tow vehicle’s wiring harness. It can be used on either the 4 or 5 pin flat plug normally found on small trailer applications. To use insert the Harness Checker into the connector on the tow vehicle before hooking on to the trailer. Apply the power to your head/running lights, turn signals and backup lights. The LED’s should illuminate. You can remove the harness checker or leave it in-line to continuously monitor the lighting system on the tow vehicle.


Some of these products contain a chemical known to the State of California that
could causecancer, birth defects and/or other reproductive harm. More info here.

Certains de ces produits contiennent un produit chimique connu de l'État de Californie cela pourrait causer le cancer, des malformations congénitales et / ou d'autres problèmes de reproduction. Plus d'infos ici.

Algunos de estos productos contienen una sustancia química conocida por el Estado de California que podría causar cáncer, defectos de nacimiento y / u otros daños reproductivos. Más información aquí.