Recently my subs stopped playing. I checked the amp and it was on but it wasn't registering anything on its meters (Audiobahn). Well I was planning on cleaning the motor and I noticed that the neg terminal was pretty nasty, so I cleaned it off and the subs worked for a few days. Today I cleaned it again (battery has a slight crack near post) and again the subs worked. The amp is not grounded to the battery for those who might be wondering. Any thoughts?