my shifter does not go all the way into park on 1997 Chevrolet Malibu

when i trun off my car its like it still is running on alternator it is not the ingnition i use to be able to jiggle the shifter and it would click the head was replaced now it wont even do trhat

Asked by for the 1997 Chevrolet Malibu
Wwwhhhaattt, running of the alternator??