Recommendations For 7-Way to 5-Way Trailer Wire Adapters
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.
Products Referenced in This Question
Adapter 7 Pole to 5 Pole Flat Wired Adapter
- Trailer Wiring
- Wiring Adapters
- Single-Function Adapter
- 0 - 5 Feet Long
- 7 Round - Blade
- Plug and Lead
- 5 Flat
- Optronics
more information >
Hopkins Heavy-Duty Trailer Coiled Wire Adapter 7-Way to 5-Way Flat with Nite-Glow
- Trailer Wiring
- Wiring Adapters
- Single-Function Adapter
- 0 - 5 Feet Long
- 7 Round - Blade
- Plug and Lead
- 4 Flat
- 5 Flat
- Hopkins
more information >
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
- Plug Only
- 7 Round - Blade
- Pollak
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: 7-Pole Blade to 5-Pole Flat Connector Wired Trailer Adapter - Coiled Cable - 94-1/2" Long
- Q&A: Troubleshooting Prodigy P3 Showing No Trailer Connected to Trailer 5-Way Connector
- Shop: Trailer Wiring Junction Box
- Shop: Hopkins 7-Way RV Style Connector with Molded Cable - Trailer End - 8' Long - RV Standard
- Article: Trailer Wiring Diagrams
- Shop: Adapter 7 Pole to 5 Pole Flat Wired Adapter
- Video: Trailer Brake Controller Installation - 2009 Toyota Tacoma
- Shop: MORryde RV Ceiling TV Mount - Flip Down/Swivel/Tilt - 25 lb Capacity - Steel
- Shop: Trailer Wiring
- Shop: Brake Controller
- Shop: Camper Tie-Downs
- Shop: Towing Mirrors
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Shop: Ring Terminal - 12-10 Gauge Wire - 3/16" Ring ID
- Shop: Brophy Stake Pocket Mounted Camper Tie-Downs - Bed Mount - Qty 4
- Shop: Vehicle Tow Bar Wiring
- Search Results: tekonsha p3
- Search Results: 38656
- Search Results: h20046
- Q&A: Converting Trailer from 5-Way Connector to a 7-Way by Function
- Video: Hopkins Wiring - Wiring Adapters - HM47085 Review
- Video: Optronics Wiring - Wiring Adapters - A57CCB Review
- Article: Wiring Trailer Lights with a 5-Way Plug (It's Easier Than You Think)
- Q&A: Wiring For Trailer With Brakes For Compatibility With 7-Way Connector On 2016 Dodge 2500
- Q&A: How to Connect Vehicle with 7-Way to Trailer with 5-Pole Flat Wiring for Surge Brake Lockout
- Q&A: How To Replace 7-Way Trailer Connector On Trailer with 5 Wires
- Q&A: Is the Yellow Wire For the Reverse Lights On the 7-Way Molded Trailer Wire Connector H20043
- Q&A: Where Does Sliding Lock of 2019 Triton EZ Loader Trailer Mount on the Tongue?
- Article: Towing a Trailer? Let's Talk About Brake Controllers
- Video: Review of Dexter Axle Emergency Break Away Cable Repair Kit - DX64XR
on Trailer Wiring
