What Are Heavy Duty Wiring Harnesses

Written by hitchweb Team
Tuesday, December 27, 2011 — No Comments Yet

The common adapter rule is that adapters should only be used to go from bigger to smaller plugs, but there is a wiring harness that can get around that rule.

Manufacturers took a 7-Blade Plug and wired a 4 prong onto it so that we could plug into a 4 prong on the back of the tow vehicle. In addition to wiring on the 4 prong, they also wired on 3 extra wires.

Heavy Duty Wiring Harness

Now all 7 wires on a 7-Blade plug can be hooked up to power from the vehicle.Harnesses are useful in upgrading vehicles which already have a 4 prong or 6 pin wired in, but need to use a 7-Blade plug. The harness takes advantage of the wiring work that's already been done, only requiring that the installer splice the extra wires needed.

Above is an image of a harness that is commonly used when installing a brake control. There are several versions of the basic harness shown above. New innovations incorporate more and more options into these harnesses.

 Below is a brief look at the other styles of harnesses common in the industry.

6 Pin & 4 Flat Trailer Harness

7 Blade & 4 Flat Trailer Harness

  • Part 47175
  • Mutli-Tow 2 in 1 Harness: 6 Pin & 4 Flat
  • Provides 6 Pin & 4 Wire Flat
  • Mutli Towing capability from one central location
  • Mounts into any 6-Pin bracket
  • Weatherproof molded design
  • Pre-Wired for use with any T-connector application
  • Part 47185
  • Multi-Tow 2 in 1 Harness: 7 Blade & 4 Flat
  • Provides 7-Blade RVV & 4-Wire Flat
  • Mutli Towing capability from one central location
  • Mounts into any 7-way bracket
  • Weatherproof molded design
  • Pre-Wired for use with any T-connector application

Have a look at our 5th wheel harnesses and use the search options to narrow the one that's best suited for you. If you need any help please contact us and we'll be happy to help.

Posted in Towing 101

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