Will 4-Way Trailer Connector Still Work After Installing 4 to 7-Way Adapter # 37185
Question:
Does the 4 flat on part#37185 also work. I have two trailers one with a 4 flat and one with the 7 pole connector so just wondering if the place for the 4 flat actually has the connector or if its a spot to add one. Want an all in one connector. Thanks for the help in advance
asked by: Trey
Expert Reply:
Yes, the 4 to 7-Way adapter, # 37185, will have both a function 7-Way and 4-Way once it is properly installed.
To make it fully functional you will plug your existing 4-Way into the way at the back of the adapter. Then you will need to ground the white wire to the vehicle frame. The remaining wires have the following functions:
Blue for electric trailer brakes (requires a brake controller to control electric brakes)
Black is for 12 volt power (if the trailer requires 12 volt power, requires 40 amp circuit breaker, # PK54540)
Purple is for reverse lights (if the trailer has them)
You will also need extra wire such as # 10-1-1 sold in 1 foot increments.
Any of these functions that you do not need you can tape up the associated wire and stow it out of the way.
If you want everything to be fully functional then instead of # 37185, I recommend # ETBC7 which includes the # 37185 and all the wiring and accessories needed to make it functional (except a brake controller).
For a brake controller I recommend the P2, # 90885 because it is easy to set up and use and its reliable. I have included some links that you can use for either just the # 37185 installation or for the full # ETBC7 installation.
Products Referenced in This Question
Adapter 4-Pole to 7-Pole and 4-Pole
- Trailer Wiring
- Wiring Adapters
- Multi-Function Adapter
- 4 Flat
- Plug and Lead
- 4 Flat
- 7 Round - Blade
- Hopkins
more information >
Tekonsha Prodigy P2 Trailer Brake Controller - 1 to 4 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Electric over Hydraulic
- Automatic Leveling
- Under-Dash Box
- Dash Mount
- Up to 4 Axles
- LED Display
- Up to 360 Degrees
- Tekonsha
more information >
Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Accessories and Parts
- Trailer Brake Controller
- Installation Kits
- etrailer
more information >
Pollak Circuit Breaker - Cycling/Automatic Reset - 40 Amp - Straight Mount Bracket
- Accessories and Parts
- Wiring
- Circuit Breaker
- 40 Amp
- Pollak
more information >
Product Page this Question was Asked From
Adapter 4-Pole to 7-Pole and 4-Pole
- Trailer Wiring
- Wiring Adapters
- Multi-Function Adapter
- 4 Flat
- Plug and Lead
- 4 Flat
- 7 Round - Blade
- Hopkins
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Trailer Wiring Diagrams
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: Brake Controller Installation: Starting from Scratch
- Article: Brake Controller Installation on a Ford Full-Size Van
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: How to Measure for Trailer Hitch Drop
- Q&A: How To Connect 4-Way Flat Vehicle Connector To 7-Way on Trailer
- Article: How to Choose the Right Trailer Hitch Class
- Q&A: My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug
- Q&A: Parts Needed to Install 7-Way Trailer Connector on 2021 Honda Odyssey
- Q&A: Trailer Hitch for a Lance Travel Trailer
- Q&A: Can I Use a 4 Way Vehicle Connector with 7 Way Adapter and the Curt Echo Brake Controller?
- Q&A: Parts Needed For Tekonsha Prodigy P2/P3 Trailer Brake Controller on 2001 Ram 1500 No Tow Package