1992 Toyota Previa

I bought a 1992 previa cheap b/c it had 'electrical problems'. After removing all aftermarket electronics, I rewired the ignition and a few other wiring harnesses.

I charged the battery that was in it, and it was reading 10 volts at least (yes, my meter doesn't measure 12v well.). So trying to start it, the starter will start and turn the motor slightly and slowly, then the engine stops, the starter stops, and the starter solenoid provides a nice vibrant click. Further turns of the ignition may repeat the same once, then the solenoid just clicks and the starter doesn't turn at all.

Any ideas on what may be wrong? Is the motor seized? Or could it just be the starter? The starter IS turning the engine, but not by much, then it just fades to only the solenoid clicking.

Now, there WAS a lot of extra wiring in the entire vehicle, and one was specific wire was going from somewhere (don't recall exactly) and was spliced into the wiring/plug for the starter. I removed that wire and taped up the wire.