Wire Colors and Functions of Hopkins 7-Way Molded Trailer Wire Connector
Question:
I purchased this item for a past trailer and noticed the colors did not comply with what I understood to be standard trailer wire colors. Ended up crossing the colors in the junction box. Now Im working on a second trailer that was factory wired and they are using the exact same colors as this connector. This has me thinking that there is a second wire color-function chart out there. I checked the trailer wiring diagrams and it makes no mention of this second standard. Please clarify and if appropriate, supplement the wiring diagrams page.
asked by: Tim
Expert Reply:
There are two color code standards that are used in the trailer world. The Hopkins 7-Way RV style connector and cable, # H20046, that you referenced uses the RV Industry standard color code which is as follows:
White Wire - Ground
Red Wire - Left Turn/Brake
Brown Wire - Right Turn/Brake
Green Wire - Tail Lights
Blue Wire - Brake Controller Output
Black Wire - 12 Volt hot lead
Yellow Wire - Reverse Lights or Auxiliary Circuit
This color code is commonly found on camping trailers such as travel trailers and 5th wheel trailers.
Almost all other trailers such as utility, livestock, car haulers, etc. use a color code that is based on the standard 4-pin connector which is as follows:
White Wire - Ground
Yellow Wire - Left Turn/Brake
Green Wire - Right Turn/Brake
Brown Wire - Tail Lights
Blue Wire - Brake Controller Output
Black Wire - 12 Volt hot lead
Purple Wire - Reverse Lights or Auxiliary Circuit
These are the two common wiring color codes for factory wired trailers. It is very common that a previous owner or repair shop changed the wire colors because they simply used whatever wire they had on hand, so we strongly recommend tracing and testing the wires before making any final connections.
Product Page this Question was Asked From
Hopkins 7-Way RV Style Connector with Molded Cable - Trailer End - 8' Long - RV Standard
- Trailer Wiring
- Trailer Connectors
- Trailer End Connector
- 6 - 10 Feet Long
- Plug and Lead
- 7 Round - Blade
- Hopkins
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Q&A: Wire Color Chart Diagram for Installing Hopkins Multi-Tow 7-Way Blade and 4-Way # HM11141144
- Article: Trailer Wiring Diagrams
- Shop: Self-Contained Hydraulic Jack - Square Tube - Bolt On - 12,000 lbs
- Shop: Brophy D-Ring Tie Down Anchor w Backing Plate - Bolt-On - 1/2" Wide - Recessed - 1,600 lbs
- Shop: Replacement Power Unit for etrailer and Ram Hydraulic Trailer Jacks and Scissor Hoist Systems
- Search Results: 10037b
- Shop: Brake Controller
- Search Results: d rings
- Search Results: 20037b
- Shop: 5-Leaf Slipper Spring w/ Hook End for 7,000-lb Trailer Axles - 26-5/8" Long
- Shop: Replacement Cables for Conventional Ramp Door Spring - 150" Long - Qty 2
- Shop: Pollak 7 Pole to 4 Way Connector Adapter
- Shop: Hopkins 7-Way RV Style Connector with Molded Cable - Trailer End - 8' Long - RV Standard
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Search Results: single chock wheel chocks
- Shop: Trailer Wiring
- Search Results: 40975
- Search Results: wheel chock wheel chocks
- Search Results: wheel chocks
- Shop: Vehicle Tow Bar Brake System
- Shop: Vehicle Tow Bar Wiring
- Article: How to Measure for Trailer Hitch Drop
- Shop: BOLT brand vehicle and hitch locks
- Article: Wiring Trailer Lights with a 6-Way Plug (It's Easier Than You Think)
- Q&A: Is the Roadmaster Stop Light Switch Needed for the Demco SBS Stay-IN-Play DUO
- Q&A: Recommended Flat Tow Wiring Kit For A 2019 Jeep Grand Cherokee
- Q&A: How To Test A 7-Way And 6-Way Socket For Wiring Issues
- Q&A: Can The Demco Stay-In-Play Be Transferred From One Vehicle To Another?
- Q&A: Brake Light Indicator For Demco Stay-IN-Play Braking System Inside Motorhome
- Q&A: Will Demco Stay-IN-Play DUO Not Work if Battery Dies
on Trailer Wiring
Ed S.
8/8/2020
thank god you posted this! ive been struggling with this for 30 years. im right at the point of wiring a trailer and just about to re wire another. TWO color codes? damndest dumbest thing ive ever seen, but i guess you can teach an old dog a new trick. thank you!