Drainage to battery(replace volt relay & alt Need help on my 86.5 supra 7mge!!

Its been a month and two weeks now i been coming across to problems after problem and now i'm stuck...... A month ago i replace starter and soon to found out after the starter was installed the starter's harness had went bad, so i wired that harness wire to a push start botton........... THEN.. about 2 day prior my tire went flat.............this is bull man anyways striaght to the poinit >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
i replace the heatercore which the heater core was located deep in the dashboard inbetween the radio, not knowing that i had bought the wrong year of heatercore off of ebay i wasted my time and putted back my entire dashboard..... And now so stranged double checked my wires my voltage if everything were in the right place my battery suddenly drained, and yet it will not throttle now i thought it was the alternator because the car should run even when the positive is taken off of the battery it went dead, wierd?!!! if someone can help me it can only jump start how can i restore it from being drained? Oh yeah the relay the starter fuse and the circuit fuse included the volt regulator was replace too !! Need some expert attention i hope to hear ASAP!!

thank you sincerely Peter Vang