1987-1991 GMC R3500 5.7L 12SI and CS130 High Output Alternators

JS Alternators

1991 GMC R3500 5.7L 250-320-370-400amp High Output Alternator

JS Alternators

1989-1990 GMC R3500 5.7L cs130 250-320amp High Output Alternator

JS Alternators

1987-1989 GMC R3500 5.7L 12si 250-320amp High Output Alternator