Fresh Rebuild, Huge Voltage Draw
Alright so as the title states I just finished a rebuild on my car and ended up dropping the motor in and hooking everything up. Went to start the car and required a jump to get it started AND keep the jumper cables attached for it to continue to run. Had an Alternator code P0622 (Field Generator Thermal Circuit aka Can't Regulate Voltage) and the ABS sensor on. Not to mention the car was chugging like it was cam'ed (Stock cams and cam gears.) Killed the car pushed it back into the garage and proceeded to check the sensor on the Alternator and the ABS connections/fuses/relays. Found the torched section of the harness for the Alternator pigtail/socket and re-pinned it. I also had the battery and alternator tested at Autozone just for peace of mind (Both passed flawlessly).
Now I've read up on trying to see why my ABS light is on and I found a thread where someone mentioned their car was doing the same thing (starting rough, chugging, and ABS light on) and it ended up being caused by dirty battery terminals and/or the starter connections (The OP never specified which fixed his issue). This grabbed my attention and I remembered the post coming off the starter wiggling when putting the cables back on. I was curious if that post being loose could cause the starter to short internally and be the source of the voltage drop. The Voltage drop ONLY happens with the key is in the ON position (Not cranking just sitting in the ON position).
I pulled the harness and inspected all the wires after fixing the alternator pigtail/socket. I then threw everything back together and started to test for a parasitic draw by removing fuses one by one with a multimeter hooked up to monitor drop. Before turning the key to the ON position the battery read 12.2-5v and with the key in the ON position the voltage dropped instantly to 7.8 and slowly crept back up to about 8.5-6. When I go to turn the motor over the voltage nose dives, the starter will only click, and the interior lights will flicker in sync with the starter clicks. I'm at a loss, the harness was removed from the car during the rebuild as it was stored outside and I kept the harness in closed boxes in my garage. The starter was stored sitting on the post that I mentioned "wiggled"(possibly a mistake on my part).
Pretty much any ideas you guys may have would be greatly appreciated, I wanna diagnose this problem rather then buy a new/used harness. If you need anymore information about this please feel free to ask and I'll do my best to answer.