Complete Replacement Wiring Setup for Lights and Brakes on a Trailer
Updated 10/22/2025 | Published 09/22/2025
Products Featured in This Question
Question:
I have an old farm trailer that needs all the wiring replaced. All the wiring components are missing or rotted away. The trailer has brakes on one axle so I need wiring for that. My question is do you have a full kit for wiring a 20ft trailer? 7 pin plug, break out block, electric brake controller, wiring, lights, etc.
asked by: Jeff K
Expert Reply:
Hey Jeff. We have all of those parts, and I have listed them below, but no there is no one and done kit for a 20' farm trailer's brakes and lights.
7-Way Connector and Junction Box - 7-Way Molded Trailer Wire Connector, 6' Long item # H20044 and Trailer Wiring Junction Box item # 38656
Breakaway Kit - Bright Way Trailer Breakaway Kit with Charger, LED Tester, and 5 Ah Battery item # 3802346
Brake Wire - Deka Jacketed 2 Wire, 10 Gauge, Brake Wire - per Foot item # 10-2-1
Butt Connectors - Heat Shrink Butt Connector - 12-10 Gauge - Qty 10 item # DW05745-10
Trailer Lighting Kit - Peterson Light Kit for Trailers Under 80" Wide - 20' Harness - Driver and Passenger item # M540
What kind of tow vehicle, year, make, and model, do you have? I can make a more accurate recommendation for a brake controller if I can get this information from you.
You can add this information and any other questions you have where it says Reply to Jerred H and I'll be happy to answer them.
Product Page this Question was Asked From
Continue Researching
- Shop: Bright Way Trailer Breakaway Kit with Charger, LED Tester, and 5 Ah Battery - Side Load
- Shop: Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS
- Video: Converting Your M1101 Military Cargo Trailer to 7 Way Wiring
- Shop: Curt Trailer Breakaway Kit with Trickle Charger, LED Tester, and 5 Ah Lead Acid Battery - Side Load
- Shop: Optronics LED Trailer Clearance or Side Marker Light - Submersible - 3 Diodes - Round - Red Lens
- Shop: etrailer 7-Way RV Style Connector with Molded Cable - Trailer End - 6' Long - RV Standard
- Shop: 2-Wire Pigtail for Optronics Trailer Lights - 2-Prong PL-10 Plug - 135" Lead
- Shop: etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector
- Video: Review of TecNiq Trailer Lights - Vertical License Plate Lamp - TN34TR
- Search Results: trailer breakaway kit
- Video: Ultimate Overview of the LED Trailer License Plate Light
- Video: Complete Breakdown of the LED Trailer License Plate Light Kit with Bracket
- Video: Review of Optronics Trailer Lights - Submersible LED License Plate Light - OPT44WR
- Video: LED Trailer License Plate Light Spec Review
- Video: Review of CURT Trailer Breakaway Kit - Kit with Push Test Charger - C52042
- Search Results: trailer junction box
- Search Results: hatch
- Search Results: electric break kit
- Search Results: trailer break controller
- Search Results: rv access doors
- Search Results: trailer axles
- Q&A: Breakaway Kit Recommended for Triple Axle Trailer
- Shop: Trailer Wiring
- Q&A: Hydraulic Drum Brake to Electric Drum Brake Conversion for 8-247 Hubs
- Q&A: Will The Peterson M540 Light Kit Fit A Bracket With 2-1/4" of Head Room?
- Shop: Brake Controller
- Q&A: Can a Trailer Wiring Junction Box Be Used on a Trailer with a Battery and Power Inverter
- Q&A: Does a Trailer Junction Box Have to be Used when Switching from 4-Way to 7-Way Trailer Connector
- Q&A: Parts Needed To Convert An EZ Loader Boat Trailer From Surge To Electric Brakes
- Q&A: Adding a Battery on an Enclosed Trailer to Power Interior Lights
on Accessories and Parts
Jerred H.
10/22/2025
Hey Jeff, how did things go getting your farm trailer rewired with the parts Jerred listed? Your update could make it easier for others tackling a full wiring replacement on an older trailer.