Troubleshooting Fuses and Relays for 12V Power on 7-Way Trailer Connector of 2008 Ford F-450
Question:
I have a 2008 Ford F4 50 I have no power to the 12 V wire on my plug in the rear of the truck I do not have the owners manual I don’t know where the fuse is for that I appreciate any help you can give me thank you
asked by: Loren J
Helpful Expert Reply:
I looked up your owners manual in a web search and was able to find that fuse 33 in the fuse box in the passenger side of your cab is one place to check. Relay 44 and relay 56 in the engine bay power distribution box also impact that 12v Power at your trailer connector.
With relays testing isn't easy so simply replacing them with one you know works is the best option. Then you can use a circuit tester like # PTW2993 to test your 7-way at the 1 o'clock position for power.
Products Referenced in This Question
Product Page this Question was Asked From
Curt 7-Way to RV Socket LED Circuit Tester - Vehicle End
- Electrical Tools
- Testers
- Circuit Tester
- Tow Function Tester
- CURT
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Q&A: Wire Colors for 7-Way Trailer Connector on a 2007 Ford F-250/F-350
- Search Results: ford puck system
- Shop: Trailer Wiring
- Shop: Bright Ideas 12V RV and Utility LED Light Strip - 12" Long - Silver - Qty 1
- Shop: Fifth Wheel Hitch
- Shop: Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches
- Shop: B&W Companion 5th Wheel Trailer Hitch - Dual Jaw - 20,000 lbs
- Search Results: rp30073
- Video: Review of Buyers Products Trailer Cargo Organizers - Toolbox - 3371712250
- Q&A: Re-Wiring 7-Way RV Style Trailer Side Wiring Connector
- Shop: Buyers Products Utility Storage Box - Black - 51" x 19-1/2" x 22-1/2"
- Shop: Hopkins Endurance Quick-Install 7-Way Trailer Connector
- Shop: Hook Probe Circuit Tester
- Q&A: Troubleshooting Lack of 12V Power at 7-Way Trailer Connector on 2019 Ford F-150
- Q&A: Where is 12 Volt Trailer Wiring Circuit on 2019 Ford F-450
- Shop: Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors
- Shop: Gooseneck Hitch
- Search Results: rp30126
- Search Results: ford fifth wheel prep package
- Search Results: under bed fifth wheel mount
- Search Results: 5th wheel prep package
- Search Results: puck system
- Video: Choosing the Right Trailer Wiring
- Q&A: Timren Axle-Less System Recommendation for an Offroad Traile Built Off 2015 Starcraft
- Q&A: Can Timbren Axle-Less Kits be Used as Tandem Axle Setup
- Article: Trailer Wiring Diagrams
- Shop: Trailer Hitch
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Video: Choosing the Best Fifth Wheel Hitch
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)