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
- Article: Trailer Wiring Diagrams
- Q&A: Adding a Battery on an Enclosed Trailer to Power Interior Lights
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Can a DC to DC Charger Be Mounted in a Trailer's Battery Box to Keep the Trailer Battery Charged?
- Article: Trailer Lighting Requirements
- Q&A: Is there a Weigh Safe 180 Hitch 2 Ball Mount w/a Tongue Weight Scale?
- Article: Breakaway Kit Installation for Single and Dual Brake Axle Trailers
- Q&A: Adding Interior Lights to Trailer and Keep Battery Charged
- Q&A: Installation Time for Blue Ox BX1128 Flat Tow Base Plate Kit for 2016 Jeep Grand Cherokee
- Q&A: Dimensions for Buyers Product Wiring Junction Box # 3375601101
- Q&A: What Gauge Wire Should be Used to Wire Trailer Brakes
- Article: How to Measure for Trailer Hitch Drop
- Article: How to Choose a High-Low Adapter
- Article: Brake Controller Installation: Starting from Scratch
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.