Parts Needed to Re-Wire 18 Foot Car Hauler Trailer with 7-Way Connector
Question:
Im having trouble finding everything I need. Looking to re do all the wiring on a 18foot car hauler trailer with brakes on one axle. So I need all wiring with round, 7 pin connector, I should be able to use existing lights. And also any type of manual you would have to help me with wiring brakes since Im unfamiliar with that. Thanks.
asked by: Mike H
Expert Reply:
To re-wire your 18 foot car hauler with electric brakes on one axle, I recommend using a wiring junction box like # 38656 in order to make the connections from the lights and brakes. Then for a 7-way trailer plug, you can use the Hopkins # H20046. This connector has an 8 foot lead. The shorter 6 foot # H20044 or 4 foot # H20043 trailer connectors are also available.
I recommend using a circuit tester like # 40376 to determine the functions for any wires that are not known, as just using the wire colors may not be reliable.
Next you will need ring terminals to make all the needed connections in the junction box for your lights and brakes. For 10-12 gauge wires you will use # DW05741-1 and for 14-16 gauge wires you will use # DW05702-1.
You will then use 10 gauge wire like # 10-1-1, which is sold by the foot, to connect from the electric brakes on your trailer to the junction box. Either of the two wires coming from each brake assembly can be used for grounding to the trailer frame because brakes are non-polarized. You will use the other wire for power. You can use butt connectors # 05732-2 for the brake circuit wire. I have attached an electric brake installation video for you to review. Right around the 5:23 mark in the video you can see the wire connections being made.
I have also included a helpful article on trailer wiring as well as an installation video for the junction box that you may find helpful.
Products Referenced in This Question
Ring Terminal -16-14 Gauge - 1/4" Ring ID - Qty. 1
- Wiring
- Wire Connectors
- Ring Terminals
- 1/4 Inch Diameter
- 16-14 Gauge
- Deka
more information >
Deka Ring Terminal - 12-10 Gauge - 3/8" Ring ID - Nylon Insulation - Yellow - Qty 1
- Wiring
- Wire Connectors
- Ring Terminals
- 3/8 Inch Diameter
- 12-10 Gauge
- Deka
more information >
7-Way Molded Trailer Wire Connector, 4' Long
- Trailer Wiring
- Trailer Connectors
- Trailer End Connector
- 0 - 5 Feet Long
- Plug and Lead
- 7 Round - Blade
- Hopkins
more information >
7-Way Molded Trailer Wire Connector, 6' Long
- Trailer Wiring
- Trailer Connectors
- Trailer End Connector
- 6 - 10 Feet Long
- Plug and Lead
- 7 Round - Blade
- Hopkins
more information >
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 >
Product Page this Question was Asked From
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: Trailer Wiring Diagrams
- Video: Spectro Trailer Wiring Junction Box Installation
- Shop: Trailer Wiring Junction Box
- Shop: etrailer Electric Trailer Brakes - Self-Adjusting - 12" - Left/Right Hand - 5.2K to 7K
- Video: Dexter Axle Trailer Hubs and Drums - Hub with Integrated Drum - 8-201-9UC3-EZ Review
- Shop: Trailer Wiring
- Shop: Hopkins 7-Way RV Style Connector with Molded Cable - Trailer End - 8' Long - RV Standard
- Search Results: akhd~865~7~2~k
- Search Results: brkh12
- Search Results: akebrk~7~sa
- Search Results: 23~464~465
- Search Results: akhd~865~7~2~ez~k
- Shop: Mounting Bolts and Hardware for 12" Brake Assemblies
- Shop: 5-Leaf Slipper Spring w/ Hook End for 6,000-lb Trailer Axles - 27" Long
- Shop: Easy Grease Trailer Hub and Drum Assembly for 5.2K - 7K Axles - 12" - 8 on 6.5 - Pre-Greased
- Shop: Dexter Nev-R-Adjust Electric Trailer Brakes - 12" - Left/Right Hand Assemblies - 7K
- Article: How to Accurately Measure Trailer Leaf Springs
- Q&A: Wiring a 7-Way to a Trailer with a 6-Way that Uses Non Standard Colors
- Search Results: 7 pin connectors
- Search Results: 7 pin wiring connector
- Shop: Trailer Hitch
- Video: Hopkins Wiring - Trailer Connectors - H20046 Review
- Video: Review of Hughes Autoformers RV Surge Protectors - Voltage Booster - HU24FR
- Video: Trailer Brakes and Wiring Installation
- Video: Review of Deka Wiring - Jacketed 14 Guage 7 Wire Cable - DK74FR
- Article: Trailer Tire Sizing
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Shop: Vehicle Tow Bar Wiring
- Q&A: What Gauge Wire Is Required On a 7-Way Connector
- Q&A: How to Wire 12V Battery in Enclosed Trailer to Power Trailer Lights Independent of 7-Way Connection
on Accessories and Parts
