Charging system problem

Okay, I read through some of your answers and you seem to know what you are talking about, so I have a question if you have the time. My car listed above ltd Crown Victoria has an alternator without an alt plug. Just three wires going to the field, ground and hot. I've only guessed which are which as far as that cause I can't find a specific diagram for the charging system. The voltage regulator is body-mounted near the front right of the engine bay about a foot away from the alternator. My problem is long term discharge that recently became a short term discharge. I was driving it to work every day except weekends but I still drove it basically every day. Then I lost my job recently and it was sitting for days at a time. I went to start it up one day a week ago and it wouldn't start. I volt metered it and it read 12.2v (under 25%) so I had AutoZone check my interstate battery, they said it was bad. I assumed sulfadized. So I bought an Everstart or whatever the cheap AutoZone brand is and after a week, it died on me on the road three times going home. It took a jump the first and second time but I had to pull over and pull the battery out and take it to AutoZone to charge it before I got it home finally. About four days ago now. I've since recharged the battery and had the charging system tested; the alternator passed but the regulator failed. So over the course of the last few days I have cleaned the rusty A (A I F S) post on the volt regulator, replaced the pigtail and rusty plug on volt reg. I metered the alternator while the engine is off and I have got 11-12v on one of the alternator bolts (the black one on alternator), and nothing on the other two (orange/blue and yellow with a red cap plug). When the engine is on I get 12-13v on the black wire, 10-11v on the yellow red cap, and 6v on the blue/orange. Battery is at 12.5v off and 12.3 running at approximately. 2,000 rpm.(So old it doesn't have a rpm meter so I have to guess) I've cleaned the volt regulator post and replaced pigtail and clip. I can't really tell if I still have a power draw but the car still shut off when I take the negative cable off. I know you don't like doing that but my layman's understanding is that my charging system should compensate and keep the car running when I do that, so I think my problem still exists. Any help or wisdom you could give would be helpful. Thank you