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1st Gen Ram Tech'93 & older Rams: This section is for TECHNICAL discussions only, that involve 1993 Rams and older. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Something doesn't sound right. You can reset the computer i think by cycling the key something like 3 or 5 times. Your check engine light should flash. I think. But i think that only clears codes.
Changing the alternator shouldn't change your idle, but if you want to reset the computer, just leave your battery terminal off for a coupe minutes and it will reset. If that doesn't correct it then you have something else going on... make sure you didnt knock off any vacuum lines or wires while you were changing the alt.