How to Provide Maintenance Charge to 2014 GMC Sierra 1500 battery While Flat Towing Behind RV

Question:

I recently a drive line disconnect and Blue Ox towing package installed on my 2014 GMC 1500 Sierra two wheel drive, i need to leave the key on to while towing is there a power disconnect or fuse that can be removed so my batteries say charged?

asked by: Ken B

Expert Reply:

The first thing you are going to want to do is look up GM technical service bulletin 13-00-89-007 for information on disconnecting the truck battery. The battery does have to be disconnected to flat tow your 2014 GMC Sierra. Consult the truck owners manual to confirm.

To keep a maintenance charge on the battery I recommend using a harness such as # BX88206 with the tow bar wiring you will be using so that you can run a wire from the connector at the front of the truck to the vehicle battery.

There are a couple of ways to do this. First, you can tap into the running light circuit in the tow bar wiring but to provide power to the battery the RV running lights would have to be on all the time. Or if the connector at the back of the RV has a working 12 volt circuit you could use that circuit instead.

Which ever way you choose you would just attach the wire to the appropriate corresponding pin at the back of the connector that will be at the front of the truck and the other end of that wire will go to the positive battery terminal.

expert reply by: Michael H