It was the battery, 2 cells had shorted out.
The battery was only about 2 years old, had it installed by the dealership after the old one went dead over a weekend of no driving.
So I just assumed the battery was newer and ok.
The garage had already came and towed away the truck, I even had a spare battery in the basement. I could have saved the towing.
Any how I'm glad it was simple and not electrical system short.
Thanks for your help.
Also: charging a shorted battery ruins a battery charger
Mine just started smoking after about 1 minute, thats why I thought there was a short in the truck wiring, never thought to blame the battery.