Connecting an RV to a Tow Dolly with a 4-Way an Extra Blue Wire for Brakes
Question:
My tow dolly has 4 wire plug and a single blue wire my Rv had 5 wire plug how could I make work
asked by: Gil
Expert Reply:
It's likely the extra blue wire on the tow dolly goes to its brakes. The best way to wire to tow dolly to operate its brakes is to cut off the existing 4-way and add a 7-way like # HS381-9000. This uses a junction box to make it easier to make the connections and includes everything you'll need.
If you don't already have a 7-way on the RV you can use our # ETBC7 kit to add one.
Before you do any of this make sure the blue wire on the dolly is indeed for the brakes. If not let me know what it functions and I'll recommend a way to make the connection.
Products Referenced in This Question
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 >
Product Page this Question was Asked From
Wiring Kit for Hydrastar Electric Over Hydraulic Actuators
- Accessories and Parts
- Brake Actuator
- Disc Brakes
- Hydraulic Drum Brakes
- Wiring
- Hydrastar
more information >
Featured Help Information
Instructions
Continue Researching
- Article: Wiring Trailer Lights with a 6-Way Plug (It's Easier Than You Think)
- Q&A: Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work
- Q&A: Trailer Running Lights Not Functioning with a 2007 Dodge Ram Pickup
- Q&A: Troubleshooting a 2007 Dodge Ram 3500 That Is Not Getting Power to the 7-Way
- Q&A: Old Trailer Wiring 5-Way had 6 Wires But New 5-Way Has 5 Wires
- Q&A: Recommended Wiring For Tow Dolly And Vehicle Lights For Towing Behind Motorhome
- Q&A: Recommended 7-Way to 4-Way Adapter Just for Trailer Lights
- Q&A: Installing Electric Brakes on a Vehicle Tow Dolly
- Article: Wiring Trailer Lights with a 5-Way Plug (It's Easier Than You Think)
- Shop: Hook Probe Circuit Tester
- Shop: Wiring Kit for Hydrastar Electric Over Hydraulic Actuators
- Shop: 35 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 42" Ground
- Video: Performance Tool Hook Probe Circuit Tester Review
- Search Results: tow dolly parts
- Shop: Brake Controller
- Shop: Winch Ratchet Repair Kit by Dutton-Lainson
- Shop: Replacement Right Side Ratchet Winch for Demco Kar Kaddy 3 Tow Dolly
- Shop: Demco Kar Kaddy Winch Pawl Repair Parts Kit
- Video: Choosing the Right Brake Controller
- Shop: Trailer Hitch
- Shop: Tekonsha Prodigy P3 Trailer Brake Controller - 1 to 4 Axles - Proportional
- Search Results: 44649
- Article: Trailer Wiring Diagrams
- Search Results: 68149
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: Choosing the Right Trailer Wiring
- Shop: Trailer Wiring
- Article: Brake Controller Installation: Starting from Scratch
- Shop: Gooseneck Hitch
- Search Results: 25580