I think i fryed the batterie charger.

so now that i put my system in i am having major charging problems (even worse then before). At night you only get two options. Headlights and heater or headlights and music.
Anyway. I went to give my batt. a full charge and The positive and the ground wire on the batt. charger crossed togather a little too long. Now the thing does nothing when turned on. Is this fixable?
P.s. If anyone has a 130amp +, 3g conversion the are selling let me know.

Thanks