No Power at 7-Way Charge Circuit On 1999 Ford F-250
Updated 12/04/2025 | Published 08/24/2019
Products Featured in This Question
Question:
I have A 1999 F250 and No Power at the 7 pin connector. it had a good 30A Fuse #24. I went to look for the second relay box that was hanging off to the power distribution Fuse box. but could not find one anywhere. Any Ideas? 1999 Ford F250 no relay box for battery charging.
asked by: Mike B
Expert Reply:
The relay box on your 1999 Ford F-250 is actually located in the engine compartment near the brake master cylinder. Since it sounds like you don't have power at the 7-way at all you probably need a new 30A fuse in location 16 for the trailer battery charge. The battery charge also has a relay in location 39.
If you replace the fuses and still do not have power at the 7-way you most likely need to replace it. If the Ford has a factory tow package, you can replace the plug with part # C55774. If you Ford only came with a 4-way connector you can replace it with part # C55243 which actually comes with the relays you need to activate the tow package.
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- Factory Tow Package
- 4 Flat
- 7 Blade
- Plug and Lead
- Plug-In
- CURT
more information >
Featured Help Information
Instructions
Continue Researching
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Trailer Wiring Diagrams
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Gooseneck Hitch for 2026 Ram 3500 Big Horn Short Bed
- Q&A: Blue Ox Base Plate Kit that Fits 2024 Jeep Gladiator Rubicon with Plastic Bumpers
- Q&A: Wiring Needed To Tow a Trailer With Brakes With a 2025 Ford Ranger no Tow Package
- Article: Brake Controller Installation: Starting from Scratch
- Q&A: Parts Needed To Add 7-Way And Brake Controller To 2024 Ford Transit T-250
- Article: How to Choose the Right Trailer Hitch Class
- Q&A: Best Rear Suspension Enhancement For 2020 Ram 2500 4WD With In-Bed Gooseneck Hitch
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Q&A: My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug
- Article: How to Install a Brake Controller on Chevrolet / GMC 1999-2006 Pickups
- Article: Aftermarket Brake Control Wiring for 07-13 GM Full-Size Truck with Factory-Integrated Brake Control
Danny
12/4/2025
My 1999 f250 power stroke under hood fuse box doesn’t have a spot for #39 brake relay