Inside the box I have the terminal going to one coil, and then jumpers from + to + and - to -.
My question is if one of the wire fell out (WHICH IS SHOULDNT, they are in there pretty well, they are push terminals) would you be able to tell if only one coil was being powered? would this hurt the sub, and what would the symptoms be?
not certain as to which wire came loose, but no. running one vc won't damage your sub. you'll just get a peakier resonance and less power to your driver.