Alternator wiring????

[bbarooo]

I am hoping someone else has run into this. I have a 71 Blazer that the po converted to an internally regulated alternator eliminating the regulator on the core support. The battery lead is connected to the post on the alternator and then jumpered back to one of the two plug terminals. The other wire disapears into the harness back to the firewall. I have an amp draw killing the battery that only goes away when I unplug the alternator. Any ideas??