Troubleshooting Trailer Wiring Connection for Lack of Brake Lights
Question:
My 2004 winnabago rialta came factory wired with a 6 pin round trailer connector. My boat and utility trailers have 4 way flat connectors. I bought a basic Hopkins 6 round to 4 flat adapter and got right and left directionals and running lights but no brake lights. I bought the Hopkins 47320 and got the same results. The led lights on the adapter worked for all lights except the brakes. An electric tester showed power to the rialta brake light pin but it does not connect to the trailer side of the hopkins adapters. Both trailers lights all work properly when connected to my GMC work van and Jeep wrangler 4 way flat connectors. I do not know why the adapters do not work properly.
asked by: Bill S
Expert Reply:
The Hopkins Endurance Flex Trailer Connector Adapter w/ LED Circuit Tester - 6-Pole to 4-Pole # HM47320 and the other adapter you used most likely are not the issue. I recommend testing your 6-way connector with a circuit tester like # PTW2993 to ensure you have both brake and turn signal function on each of the lower pins.
If you have both the right turn and stop and the left turn and stop, then we know your vehicle connection is good. Since we know your trailer works with other vehicles, the only thing to cause the trailer and vehicle not to work together well isn't the adapter but rather a bad ground. Often a bad ground on a trailer will allow vehicle that produce more power through the trailer wires to still work even when the ground needs to be improved. I recommend checking the main ground connection on your trailer for a bare metal to metal connection free of rust or debris and then checking the trailer tail lights as they often have a separate ground sometimes through the mounting hardware.
Products Referenced in This Question
Hopkins Endurance Flex Trailer Connector Adapter w/ LED Circuit Tester - 6-Pole to 4-Pole
- Trailer Wiring
- Wiring Adapters
- Single-Function Adapter
- 0 - 5 Feet Long
- 6 Round
- Plug and Lead
- 4 Flat
- Hopkins
more information >
Product Page this Question was Asked From
Adapter 6-Pole Round to 4-Flat with Cover
- Trailer Wiring
- Wiring Adapters
- Single-Function Adapter
- 6 Round
- 4 Flat
- Hopkins
more information >
Continue Researching
- Shop: Vehicle Tow Bar Wiring
- Shop: Trailer Wiring
- Shop: Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit
- Shop: Roadmaster Extension Loop for Towed Vehicles - Dual 4-Way Flat Trailer Ends - 6' Long
- Shop: Hopkins Endurance Quick-Fix Replacement 4-Way Flat Trailer Connector w LED Test Lights - Vehicle End
- Shop: Hopkins Endurance 4-Way Flat Trailer Connector w/ 48" Harness and Ergonomic Pull
- Video: Roadmaster Tow Bar Wiring RM-300150-00 Review
- Shop: Hopkins Trailer Connector Adapter - 7-Pole Round Pin to 7-Pole RV
- Shop: Base Plate for Tow Bar
- Search Results: 30717
- Search Results: circuit tester
- Search Results: jumper harness
- Search Results: 4 flat male to 4 flat male
- Search Results: 47465
- Video: Hopkins Wiring - Wiring Adapters - 47405 Review
- Video: Hopkins Wiring - Wiring Adapters - HM47180 Review
- Shop: Hopkins Endurance Flex Trailer Connector Adapter w/ LED Circuit Tester - 6-Pole to 4-Pole
- Shop: Mighty Cord Trailer Connector Adapter - 4-Way Flat to 6-Way Round - 12" Long
- Q&A: Will the Hopkins Endurance Flex Trailer Connector Adapter # HM47320 work on a Harley Trike
- Q&A: What Are My Wiring Options for Flat Towing a 2011 Honda CRV
- Q&A: Parts Needed To Add 4-Way Flat Connector On a Rialta Camper With 6-Way Pin Connector
- Q&A: Adapter for 7-Way or 6-Way to Plug Into 4-Way on Vehicle Being Flat Towed
- Q&A: Adapting a 4-Way Flat Trailer Connector on 2011 Toyota Tacoma to 6 Round on 1983 Coleman Camper
- Q&A: How To Make 5' 6-way Round to 4-way Flat Wiring Adapter
- Video: Roadmaster Tow Bar Wiring RM-164-7 Review
- Search Results: 7 wire to 6 wire
- Search Results: roadmaster 7 wire to 4 wire flexo coil
- Q&A: Recommended Wiring Harness for 5th Wheel With Separate Circuits to Have a 4 Way Connector for Towing
- Video: Deka Jacketed 6-Wire Installation
- Video: Hopkins Wiring - Trailer Connectors - HM48440 Review