Any input appreciated!

All started last week.
Drove to friends house, Left, would not start.

Bright headlights, clean battery connections. Jumped across solenoid on firewall, no start.

Replaced solenoid on firewall. No start.

Replaced starter. Started OK but the starting gear would not disengage. In other words the starter was running the same as idle speed.

Thought it was an alignment problem, started tightening and loosing the bolts around the starter and accidentally with the wrench shorted out the solenoid on the starter and the starter gear disengaged.

Drove home.

On way home, battery light came on, replaced the alternator, battery light goes out.

I suspected alternator was bad a few weeks ago as there was a high pitched noise on start up briefly. Thought it was just cold weather, but found other folks on forum with same problem and it was the alternator. Alternator 20 months old.

Battery light now not on.

Now seems to have a drain problem. Battery is about 20 months old.
Connected test light between negative (ground) battery post and battery cable. Getting bright light. Also tested with amp meter, and it is over 50 milliamps.

Pulled fuses under hood, test light still on.
Pulled small wire on solenoid on firewall, test light still on.
Pulled all wires off of starter, test light still on.
Pulled cable from alternator, test light still on.

Battery voltage around 12 when running. Tells me the alternator is not working.

Started checking wires, and I was an idiot and did not get the alternator connector all the way in.
Reconnected the wire on the alternator.

Started to check battery voltage when running and AGAIN the starter gear did not disengage and the starter was running at engine speed!

Somehow the solenoid is getting current and engaging.

Thanks!!!