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First off, have you positively verified the alternator as the culprit, by disconnecting it and making sure the battery stays up for a couple of days with it unhooked? If the alternator IS the culprit, I'd replace it with a 3-wire alternator. IMHO, the single wire alternators are more trouble than they're worth, and it is so SIMPLE to do the job right with a standard 3-wire alternator. An added advantage is that the 3-wire unit will begin to charge at idle, and won't need the throttle "goosed" for charging to begin. Hooking up a three-wire alternator is not difficult. All that's needed is to install the alternator, hook the large output wire to the large stud on the alternator, install a jumper wire from the large stud to the #2 regulator terminal, and then connect the #1 terminal to the switched side of the ignition switch, with a diode or "idiot light" in the lead to the #1 terminal. Of course, if you want to keep the one-wire unit, you could have it checked out at an electrical shop. However, if it needs any repairs at all, you could probably pick up a rebuilt (better) standard alternator for what it will cost to change out the regulator or diodes in the one-wire unit. (The one-wire units DO have a reputation for draining the battery faster in an inactive unit than a standard alternator, but that should be over a period of weeks, or several months, rather than immediately.)
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