Heavy Duty Alternator

24SI and 28SI Alternator Core Identification

Use this page to help identify the correct core group for your core returns.  If you know the part number, please visit our e-catalog for model family idenfication.

24SI Alternator Core


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24SI regulator is flat.

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24SI casting fins are attached (pad mount only).

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24SI pad mounts are round.

28SI Alternator Core


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28SI regular has fins.

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28SI casting fins are short (pad mount only).

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28SI pad mounts are square.