Another Electrical Anomaly

OK, after having to get a complete rear axles rebuild, I drove the car home and all seemed well. When pulling onto the garage I turn the car off and blow the horn to alert the wife.

The horns really didn't blow just made a low pitch weird sound. Strangely enough the volt gage almost pegged fully to the left. Keep in mind the key is NOT in the car.

Pulled the lights on and same thing needle movement to the left but not a full swing.

Unplugged one horn and got a good horn sound with a little movement of the volt needle to the left. Switched horn connections with the same result.

Connected both horns and got a good sound but the needle still pegging almost full left.

Any and all ideas welcome.