Turns out the adapter was defective and wasn't allowing charge to go through. Sent it back and I'll have to see if I can find a better 6v one somewhere or figure out how to wire it up myself with some relays or something.
Does anyone have experience with wiring up your own in this way?

Last edited by 5H4N3; 01/02/2015 7:13 PM.
-Shane

1950 Chevy 3100