GM Alternators

Dan the man said

Talking about the one wire hook up and internal regulator, I don't remember if it was my '89 or '98 dodge pick up had a alternator with a built in regulator and if it went bad the alternator had to be replaced as the regulator was built in and at a cost of around $300.

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Those both had the regulators built in to the computer- the '89 would have an SBEC and the '98 would be a JTEC. If either one of those fail, an external (IE the old Mopar electronic voltage regulator) regulator can be wired in instead of replacing a costly, and potentially unavailable, computer.