Why Does Power Wire of Trailer Wiring for 2011 Mazda CX-9 Have to Run to Battery Directly
Question:
Considering one of your wiring harness for my 2011 CX-9 Mazda Found the review below and had a question. Snaps in. Well built. I tapped into the 12v power from the rear accessory outlet. I found that this is live all the time and has its own 15 amp fuse. Should work just fine and made the installation MUCH easier and cleaner. 57028 I wonder how I can tell if I can tap into the 12v power at the rear accessory outlet. It would be nice to be able to do so and avoid running the wire all the way up the car to the battery. Can you tell me how one could do this?
asked by: Ceci P
Helpful Expert Reply:
If you were to run the power wire of the Curt Vehicle Wiring # 56016 to anywhere but the positive post of your vehicle battery you would void the warranty of the harness and could potentially damage the wiring of your CX-9 in the event of a short on the trailer wiring.
The purpose of the battery wire being run to the battery is so that it bypasses the delicate vehicle wiring and eliminates the potential threat of the trailer wiring damaging the vehicle's wiring. It draws all of the power for the trailer taillights through the battery wire. That is why you do want to run it to the vehicle battery.
I attached an FAQ article on routing the power wire for you to check out as well.
![Jameson C](https://images.etrailer.com/static/images/catg/people/371_tn.jpg)
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Powered Converter
- Custom Fit
- 4 Flat
- CURT
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Video: Trailer Hitch Installation - 2015 Mazda CX-9 - Curt
- Shop: Trailer Wiring
- Shop: Trailer Hitch
- Video: Draw-Tite Max-Frame Trailer Hitch Installation - 2011 Mazda CX-9
- Video: Trailer Hitch Installation - 2013 Mazda CX-9 - Draw-Tite
- Q&A: Does a Power Wire Need to be Run to Battery to Install a Curt Wiring Harness on a 2012 Mazda CX-9
- Q&A: Why Can't Curt Trailer Wiring Harness be Powered w/12 Volt Power Outlet at Back of 2011 Mazda CX-9
- Q&A: Recommended Wiring Harness for 2015 Mazda CX-9 With Factory Towing Prep Package
- Shop: etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2"
- Shop: Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Shop: Curt Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Shop: EcoHitch Hidden Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Search Results: trailer hitch
- Video: Choosing the Right Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Trailer Wiring Diagrams
- Search Results: hitch
- Q&A: Difference Between Curt and etrailer Trailer Hitch Receivers for 2020 Chevy Colorado
- Video: Tow Ready 4-Pole Mounting Bracket Installation
- Shop: etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2"
- Search Results: trailer wiring
- Q&A: What Hitch Do You Recommend for a 2024 Toyota RAV4?
- Video: Brophy Mounting Bracket for 4-Pole Flat Trailer Connector Review
- Article: How to Measure for Trailer Hitch Drop
- Shop: Brake Controller
- Shop: Roof Rack
- Search Results: wiring
Bill S.
5/23/2020
why does the mazda require a powered wiring harness, but on my 2000 Dodge Dakota, it just plugged into the tail light plugs?