Can Hopkins Trailer Wiring Use 12 V Accy Circuit for Power Wire instead of Battery
Updated 09/29/2025 | Published 09/08/2025
Question:
Question about the HOPKINS wiring harness for a 2010 Volvo V70. Can I run power from the 12volt power outlet in the rear of the car rather then running a wire to the battery? Thank you.
asked by: Alan K
0
Expert Reply:
Hey Alan, if you were to run the power wire of the Hopkins trailer wiring part # HM11143735 to the 12 volt power outlet it would probably work in the short term but if you were to have a short on the trailer wiring it would potentially damage that circuit. The reason it needs to run to the battery so that all of your vehicle wiring circuits are protected.
expert reply by:
Jameson C
0
Continue Researching
- Shop: Trailer Hitch
- Shop: Trailer Wiring
- Shop: Curt Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Video: Hopkins Custom Fit Vehicle Wiring - Trailer Hitch Wiring - HM11143735 Review
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Q&A: No Brake Lights with Hopkins Plug-In Harness On a 2013 Volvo XC70
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Q&A: Will Hopkins Wiring Harness Work With 2011 Volvo XC70?
- Q&A: Installing a T-One Wiring Harness Off a Power Source Instead of the Battery
- Q&A: Comparing Curt And Hopkins Wiring Harnesses For 2011 Volvo XC70
- Shop: etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2"
- Q&A: Comparing Curt And Hopkins Wiring Harnesses For 2011 Volvo XC70
- Q&A: Recommended Class III Hitch and 4-Way Wiring Harness for 2015 Volvo XC70
- Q&A: Recommended Trailer Hitch Receiver And 4-Way Wiring Harness For 2015 Volvo XC70
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Article: What are the Common Types of Propane Fittings Used on RVs?
Jameson C.
9/29/2025
Hey Alan, did you decide to run the power wire to the battery for your Hopkins wiring harness? I'm asking because your experience could help others who are considering similar setups.