I just installed a small amp into my car and it hs worked in my fathers car, but he had it on low input connections (rca cables) now i do not want to change my deck from stock so i have then amp on high inputs. it powers on but the light goes red then when i plug the high input (of which i took the power from the rear speakers)connection the light goes off.(when working it is green) but the fans are still on.Any idea's>?