This is a GL1500 Compu-Fire alternator. This alternator puts out 2 1/2 times the power of the stock alternator. This 90 amp alternator has a temperature compensated voltage regulator and puts out 60 amps at idle. It is recommended that you use a sealed battery with this system. It is great for bikes that have a lot of additional electrical equipment. It will fit all GL1500s from 1988-2000.