Econoline wiring questions

Hey guys. Im in the process of wiring up a 1200 inverter with a secondary marine battery in the back. I was looking through my manual and saw that I have a trailer battery charger somewhere on the econoline stock. I was wondering if it was possible to use this wiring setup for my secondary battery. Has anyone done this before with their setup and/or how did it work? Thanks for your time.

I found this in a little bit of searching. I never took any classes that pertained to this in college so I dont quit understand whats going on with it.

https://www.fleet.ford.com/truckbbas...00/130_133.PDF

Chris

To the best of my knowledge, that circuit only works if you have a trailer brake controller and all fuses and relays installed. I also don't think it's strong enough to charge a full size battery.

I may be totally wrong here, don't take what I just said as gospel.