Recommendations For 7-Way to 5-Way Trailer Wire Adapters
Updated 02/05/2013 | Published 02/04/2013
Products Featured in This Question
Question:
Hi i have a 7 hole plug for trailer but only 5 wires im trying to connect too the 7 pin plug with 7 wires on the car having great difficultly can you help. not working properly
asked by: David
Expert Reply:
You can install a 7-way trailer plug on the trailer and only wire the 5 circuits you need based on our FAQ page on wiring, which I have provided a link to. If you go this route, you will need to trace each circuit on the trailer to determine its function and then wire it to the plug accordingly. I have provided a graphic showing the function of each individual circuit on the 7-way trailer plug.
You also might need a new adapter to connect your 7-way plug on your vehicle to the 5-way plug on your trailer. If you have a 5-pole flat on your trailer, you can use a 5-pole to 7-pole adapter. If you just need the adapter and not the wire, I can recommend the Optronics Adapter 7 Pole to 5 Pole # A75TB. It is a 1-piece item with an adapter on either end.
If you need to stretch the adapters out to cover a greater distance, I recommend the Hopkins Heavy Duty Coiled Wire Adapter # HM47025. It is a coiled wire that is weatherproofed and will stretch to 3 feet at its full uncoiled length. It also lights up when connected which is tremendously useful when making a hookup in the dark.
If you are looking for a more economical way to go, you might be interested in the Optronics 7 Pole to 5 Pole Adapter # A57WB. The 2 adapters are connected by a straight 16-inch wire.
Finally, to prevent corrosion and rust within your connectors, you might be interested in the Plews & Edelmann LubriMatic Contact Grease # 11755. I have provided a link to a video showing how to properly use this product.
I have also provided a link to our FAQ page on our wiring adapter fitguide.
Product Page this Question was Asked From
Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End
- Trailer Wiring
- Trailer Connectors
- Trailer End Connector
- 7 Blade
- Plug Only
- Pollak
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Search Results: 7 way to 4 way
- Search Results: 7 way to 4 way adapter
- Shop: Trailer Wiring
- Video: Curt 7-Way to 4-Way/5-Way Trailer Adapter Review
- Shop: Adapter 7 Pole to 5 Pole Flat Wired Adapter
- Shop: Flint Hill Goods Connector Adapter - 7Way RV to 4Way Flat - 36" Cord
- Video: What to Know About the 25 Ft 5-Way Trailer Wiring Harness
- Q&A: Replacement Actuator With Electric Lockout for Fulton A60
- Shop: 40 Ft 5-Way Trailer Wiring Harness - Wishbone Style - 30" Ground - 5' Auxiliary Wire
- Shop: 25 Ft 5-Way Trailer Wiring Harness - Wishbone Style - 30" Ground - 5' Auxiliary Wire
- Shop: 20 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 30" Ground
- Video: The Low-Down on the Adapter 7 Pole to 5 Pole Flat Wired Adapter
- Shop: CURT Dodge OEM Harness Adapter
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Article: Trailer Wiring Diagrams
- Video: How to Choose a Trailer Brake Controller
- Search Results: trailer hitch
- Shop: Trailer Hitch
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Search Results: trailer wiring
- Video: Curt T-Connector Vehicle Wiring Harness Review C56040
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Shop: Brake Controller
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Search Results: trailer tires and wheels
- Article: How to Measure for Trailer Hitch Drop
- Search Results: trailer jack
- Shop: Suspension Enhancement
on Trailer Wiring
