Running a 12 Volt Trailer Connection Circuit on a 2007 GMC Classic Body Style with a Diesel Engine
Question:
How can I connect the 7 way plug so it will charge my RV batteries while driving down the road. I have found that you can add a fuse in the fuse box under the hood, but you are not supposed to add the fuse if it is a diesel or has two batteries. Naturally, I dont want to hurt my engine.
asked by: Jack S
Expert Reply:
There is a power distribution box under the hood of the 2007 GMC Sierra that has two power posts that can be used for power to a brake controller and 12 volt power to the 7-Way RV connector at the rear of the vehicle.
If your truck is equipped with a factory 7-Way and the 12 volt power circuit is not functioning you will need to check the 40 amp fuse nearest the forward most power post in the power distribution box. See photo at right.
If you do not have a factory 7-Way on your vehicle or the wiring is not completed to the forward most power post you will need to run a 10 gauge wire, item # 10-1-1, from this power post to the 7-Way at the rear of the vehicle. A 40 amp fuse will be needed in the location nearest the power post. These are available at any local auto supply. I have linked an article that shows where the power connection should be made in the 7-Way connector for you to review also.
The 12 volt circuit for charging the trailer battery will not charge a depleted battery fully but is designed to maintain a fully charged battery while the vehicle is running. You will want to use a battery charger, the NOCO Genius Mini # 329-GENIUS5 would be a great choice, to fully charge the trailer battery before trips. Once fully charged the power wire from the 7-Way will help keep the battery fully charged for times when shore power is not available.
You will want to disconnect the trailer connector when not towing to avoid draining the vehicle battery. If this is a concern you can install a battery isolator, item # PK5231201, inline with the power wire, to eliminate the possibility of draining the vehicle battery when the vehicle is not running.
Products Referenced in This Question
NOCO Genius Smart Battery Charger - AC to DC - 6V/12V - 5 Amp
- Battery Charger
- Battery Charger
- ATV
- Boat
- Car/Truck/SUV
- Generator
- Jet Ski
- Lawn Mower
- Motorcycle
- RV/Camper
- Snowmobile
- Trolling Motor
- 120 Ah
- Charges/Maintains
- 6V
- 12V
- Wall Outlet to Vehicle Battery
- NOCO
more information >
Starter Solenoid - SPST - 12 Volt - 100 Amp - Continuous Duty - Grounded
- Accessories and Parts
- Battery Boxes
- Switches and Solenoids
- 100 Amp
- Pollak
more information >
Product Page this Question was Asked From
Pollak Replacement 7-Pole, RV-Style Trailer Connector Socket - Vehicle End
- Trailer Wiring
- Trailer Connectors
- Vehicle End Connector
- Plug Only
- 7 Round - Blade
- Pollak
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: Trailer Wiring Diagrams
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: How to Choose the Right Trailer Hitch Class
- Article: Brake Controller Installation: Starting from Scratch
- Article: How to Install a Brake Controller on Chevrolet / GMC 1999-2006 Pickups
- Q&A: Availability of InvisiBrake Installation Video on 1998 Jeep Wrangler
- Q&A: Replacement for Pollak PA66-MD40 Connector
- Q&A: Recommended Flat Towing Setup for a 2016 Jeep Wrangler Using a ReadyBrute Elite II Tow Bar
- Article: Flat Towing Package for 2011 Chevrolet HHR
- Q&A: Does B and W Gooseneck Hitch # BWGNRK1217 Fit 2017 Nissan Titan XD Long Bed
- Q&A: Blule Ox Baseplate For A Diesel 2020 GMC Sierra 3500 Denali
- Q&A: Replacement Connector for a Pollak PA66-MD40
- Q&A: How To Mount Pollak Connector PA66GF30