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Napa has them, but bein is I dunno which truck you looking for, I am presuming you are wanting it for diesel. I have a 150 amp on my truck currently and am well pleased with it.
Well, ask for a altenator for a 93/94 7.3 IDI because the bracket should be pretty similar to your 300's.
Why do you want such a big altenator on your truck for??
It may just be wiser for you to invest in a high CCA battery. I currently have two interstate 1050's, so you might invest in a good battery if your wanting more power for winching, bright lights or such.
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