How to Change the Old 6 Pin Rectangular Wiring Harness to a 7-Way Wiring Harness
Products Featured in This Question
Question:
Is there any premade adapter that would be the old style male 6 pin rectangular to the new style female 7 pin round for a trailer?
asked by: John T
Expert Reply:
I do have a solution for you, but unfortunately, we do not carry an adapter that goes from the 6-Way rectangular harness to a current 7-Way harness for your trailer.
You will have to do some splicing to get the result you want. What I recommend doing is using a circuit tester, like part # PTW2993, to find out what the function is on each wire. You can either cut the harness off that you currently have, or you can use the Connector Kit # 37995 to access the wiring. You can use Butt Connectors # DW05744-5 for splicing to help seal up the connections.
You will then need to splice that wiring into a round 6-Way Harness # 50-86-007 and then connect that to a 6-Pole to 7-Pole adapter # 47435.
I have attached a link to one of our helpful articles that is about trailer wiring for you to review as well.

Featured Help Information
Miscellaneous Media






Continue Researching
- Shop: 6-Pole Square Trailer Wiring Connector Kit (Car and Trailer Ends)
- Shop: Trailer Hitch
- Shop: Hopkins Trailer Connector Adapter - 6-Pole Round to 6-Pole Square
- Shop: Curt 6-Pole Square Trailer Wiring Connector Loop - Vehicle and Trailer Ends
- Search Results: torklift r3503
- Shop: Adapter 6-Pole to 7-Pole Trailer Wiring Adapter
- Shop: Hook Probe Circuit Tester
- Q&A: Front and Rear Tie-Downs for a 1996 Ford F-350 8 Bed and Running Boards Under Cab Only
- Q&A: Highest Capacity Hitch Availability for a 1992 Ford F-350
- Q&A: Recommended Class IV Trailer Hitch Receiver For 1992 Ford F-250 Extended Cab 4WD
- Q&A: How to Determine Where to Drill to Install Torklift Hitch on 1997 Ford F-250
- Video: Review of the Pin Locks for TorkLift FastGun and Derringer Turnbuckle Handles
- Video: What to Know About the TorkLift FastGun Turnbuckles for Bed-Mounted Camper Tie-Downs
- Article: Best Vehicles to Flat Tow Behind an RV
- Search Results: clearance lights
- Search Results: 7 pin connector
- Search Results: 6 pin square to 4 pin flat
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Replacing 6-Pin Square Trailer Connector on Jayco Pop-Up Camper With a 4-Way Flat
- Search Results: 6 pin to 7 pin adapter
- Q&A: Converting 6-Way Square Plug to 4 Way Flat Trailer Wiring Connector
- Q&A: Converting a 6-Way Rectangle Plug on a Monaco Diplomat to a 4-Way Flat for a Boat Trailer
- Shop: Bright Way Push-to-Test Trailer Breakaway Kit with 1-Amp Charger and 5 Ah Battery - Top Load
- Shop: Deka Heat Shrink Butt Connector - 16-14 Gauge - Nylon Insulation - Blue - Qty 5
- Video: Finding the Right Trailer Wiring Harness
- Search Results: trailer hitch
- Shop: Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Search Results: trailer wiring
- Video: Installing the Towsmart Trailer Hitch Receiver on a 2024 Toyota RAV4