Originally Posted by franktafl
charges the batteries and powers 12v items. While you had it plugged into your vehicle for transport, it charged the batteries enough for you to operate the slide.
Actually that will depend, do they have a 4 pin or 7 pin connector (it is a 2003 model) and it is a 7 pin, do they have the charging fuse installed in the truck (Chevy sometimes forgets them), and lastly, is there 7 pin (if that is what it is) wired for charging battery ( wire from connector to battery). If all that checks out, then hooking to the truck SHOULD charge battery at a less than 10 amp (most used charge fuse size I have seen).
Sorry, I forget which pin on a 7 pin plug is for charge.