Parts Needed to Re-Wire 18 Foot Car Hauler Trailer with 7-Way Connector
Updated 05/25/2017 | Published 05/24/2017
Products Featured in This Question
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.
Product Page this Question was Asked From
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Trailer Hub and Drum Assembly - 5,200-lb and 6,000-lb Axles - 12" - 6 on 5-1/2 - Pre-Greased
- Shop: Curt Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge
- Q&A: Repair Kit for 12000-lb-Rated Bulldog Square Tube Jack
- Search Results: wire
- Shop: etrailer Electric Trailer Brakes - 12" - Left/Right Hand Assemblies - 5,200 lbs to 7,000 lbs
- Article: How to Tell the Weight Rating of a Trailer Axle
- Shop: Replacement Inner Tube with Drop Leg, Foot, and Pull Pin for Curt Heavy Duty Direct Weld Square Jack
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Search Results: trailer wiring
- Shop: Dexter Trailer Breakaway Kit with Charger and 9 Ah Battery - Top Load
- Search Results: wiring loom
- Search Results: splice
- Video: Review of TowSmart Trailer Wiring - ProClass 7 Blade Trailer Connector With Wire Tester - TS58RR
- Q&A: What Does Yellow Wire of 7-Way Molded Trailer Wire Connector H20044 Wire To
- Article: Breakaway Kit Installation for Single and Dual Brake Axle Trailers
- Shop: Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 6' Long
- Article: Trailer Wiring Diagrams
- Video: All About the Quick Splices
- Video: Review of Peterson Trailer Lights - Submersible Red LED Clearance Side Marker With Grommet - PET35PV
- Video: Review of etrailer Trailer Fenders - Black Plastic Single Axle 13 Inch Wheel - HP93RR
- Video: Breaking Down the Karrier ST175/80R13 Radial Trailer Tire with 13" Aluminum Wheel
- Q&A: Determining Hanger Spacing for Single Axle Trailer With 3,500 Pound Leaf Spring
- Q&A: How to Determine the Distance for Mounting Trailer Spring Hangers on a Single Axle Trailer
- Q&A: How to Install Spring Hangers on Single Axle Trailer
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Video: A Closer Look at the Hook Probe Circuit Tester
- Article: Wiring Trailer Lights with a 6-Way Plug (It's Easier Than You Think)
- Q&A: Charging a Trailer Breakaway System Battery Using the 12 Volt Circuit on a 7-Way Connector
- Q&A: Adding a Battery on an Enclosed Trailer to Power Interior Lights
- Article: Trailer Lighting Requirements
on Accessories and Parts
