That sounds like a pretty significant short circuit somewhere. The voltage drop would be from excess current flow. Each time the short happens the voltage drops, and to go from 14 to 8 puts a big load on the alternator as it tries to bring it up to 14.
So I am dealing with a wire shorting or a component shorting based off the reading for sure?
It might be that you just have a dangling wire somewhere that is bouncing around. The high voltage when you start might be because the battery has capacity that is being used and the alternator can supply a charge on top . As the short continues the battery dies and the alternator can't keep up with the short. Does the battery get warm while this is happening? And do you have to recharge the battery to restart the whole process?
I checked and changed all the wiring. I swapped out my main harness, EFi harness, and engine harness with very clean ones I had laying around, so there are no lose wires hanging around I cant find any components that are getting hot while the car is on.
The battery has not drained or needed to be recharged yet.
If it's not a loose wire it could be an electrical component that shorts out more as it warms up. The coil is a possibility. I think somebody mentioned that. Whatever it is should be getting hot as the current flows so touching things while the engine is warming up might find something.
I started to eliminate electrical components by swapping them with others I have but none of them seem to be the problem.
coil, dizzy, transistor, ecu, afm, dropping resistors, all fusible links, ignition switch, starter motor, fuel pump, all relays.
Another thing to check is if you have replaced fusible links with regular wire, or wired something directly to the battery with no fuse. If it is a short that's draining the battery that quickly, it really should be blowing a fuse or fusible link. That's the other benefit of fuses, they tell you where the short is.
Thanks for the response, Im going to continue to watch videos on tracking down short circuits, up my electrical knowledge! See If i can give some better descriptions to solve this.