1968-1969 GMC K3500 Pickup V8 6.5L 12si High Output Alternator Pulley:V-Belt Pulley This is a direct fit

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then 4GA is plenty

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1968-1969 GMC K3500 Pickup V8 6.5L 12si High Output Alternator Pulley:V-Belt Pulley This is a direct fitFitment: This is a direct fit high output alternator for the 1968 1969 GMC K3500 6. 5L. 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