An easy is to check the physical layout of the pins on the alternator.
If the pins are aligned like this "ll" on the rear, then it it is an external regulated alternator. Check for regulator under the washer bottle and/or bracket on the driver side of the radiator support.
If the pins are aligned like this "- -" on the side, then it is an internal regulated alternator. A 10SI will have a metal fan blade, or a 12SI, it will have a plastic fan blade.
If the pins are aligned like this
and the access is on the side, it is a CS130 alternator, internally regulated.
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