HO Alt for 89 Chevy p/u

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I need to upgrade my alternator and before I go out throwing money around for a new one I was wondering if anyone has one that they aren't using anymore. The stock alt is not all that strong and anything over 150 I would take. I am running a saz3500d and two more big 4 ch amps so the bigger the better. I believe that this is the same alternator used in many gm cars and p/u's of the same generation so it is probably very common.

Thanks

Steven

Creston California 93432

1-805-610-2553