1989 Chevrolet V3500 V8 7.4L cs144 High Output Alternator Amperage:400 amp alternator This is a direct fit

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3L 1994 - 2001 Pontiac Firebird 5

then 4GA is plenty

1989 Chevrolet V3500 V8 7.4L cs144 High Output Alternator Amperage:400 amp alternator This is a direct fitFitment: This is a direct fit high output alternator for the 1989 Chevrolet V3500 7. 4L. Being a direct fit, this alternator fits directly into your stock alternator location. Plug: This high output alternator comes with a 14. 8 Volt GM Style Internal Regulator with one wire connection. This alternator is not plug and play and must be wired with the one wire connection. NOTE: If you require charging at a certain voltage setpoint, we offer a selection