A control system that detects loosening of a vibrator component in a spreader system. As the vibrator loosens over time, it draws more current. Eventually, this excess current causes the vibrator motor to burn out. The control system detects the loosening of the vibrator to indicate a fault condition by measuring current increase in the vibrator, and then indicating a fault condition that the bolts must be tightened, which results in lowering of the current draw, thereby protecting the vibrator motor from burnout. The system has a “learning mode” capable of establishing and memorizing a baseline of current draw suitable for a vibrator. In this way, a current threshold is exceeded over time, which indicates loosening of the vibrator. The baseline level can be selectively changed adapted with changing conditions, or adapted to other types of systems besides spreader vibrators.