Parts Needed to Add a Charge Line Kit to a 1999 Chevy S-10 for Flat Towing
Updated 08/07/2025 | Published 07/05/2025
Products Featured in This Question
Question:
Im needing to setup a Battery Charge Line from my 7pin on Motorhome to my 4 pin on 1999 Chevy S-10. What kit do I need to accomplish this. I currently have the Stay-n-Play braking system in my S-10
asked by: Butch A
Expert Reply:
Hey Butch, thanks for reaching out!
To get a charge line kit setup and working on your 1999 S-10, you'll need the Charge Line Kit # RM-156-25, and then you'll need to upgrade your wiring to the Roadmaster 4-Diode Universal Wiring Kit # RM-15267.
The Roadmaster kit comes with a 6-Way connector you'll need to use to swap out the 4-Way on your S-10 with this, so you have the extra pin for the charge line wire. It also comes with a coiled wire that has the 7-Way and 6-Way ends to match your motorhome and what you'll be upgrading your S-10 to.
Product Page this Question was Asked From
Roadmaster Battery Charge Line Kit for Towed Vehicles
- Accessories and Parts
- Flat Tow Wiring Harness
- Battery Charge Line Kit
- Roadmaster
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Q&A: Recommended Flat Tow Setup For 2022 Ford Escape Plug-In Hybrid Using Blue Ox Tow Bar
- Article: Trailer Wiring Diagrams
- Article: Best Vehicles to Flat Tow Behind an RV
- Q&A: Which is Better Roadmaster or Blue Ox Tow Bar
- Q&A: Recommended Parts for Flat Towing a 2025 Ford Maverick
- Article: Must-Have Flat Towing Components
- Q&A: Choosing Between the Brake Buddy Select 3 and the Blue Ox Patriot Supplemental Braking System
- Q&A: Full Flat Tow Setup For 2023 Ford F-150 and 2026 Jayco Greyhawk
- Q&A: Will Demco Base Plate Fit 2026 For Maverick Hybrid Lariat
- Article: Flat Towing Package for 2007-2018 JK Jeep Wrangler and Wrangler Unlimited
- Q&A: Does the Curt Base Plate Kit Work w/ the Ford Modular Bumper on a 2025 Ford Bronco Everglade?
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: How to Choose a High-Low Adapter
- Article: Wiring Trailer Lights with a 6-Way Plug (It's Easier Than You Think)
Jon G.
8/7/2025
Hey Butch, how did the installation of the charge line kit and the wiring upgrade go on your S-10? I'm curious to know if everything worked out smoothly for you, as it could really help others in a similar situation.