71 c10 350 engine will not stop running when switched off

[bustedknukles]

First off THANKS in advance.

When I switch my key off engine continues to run. Been doing a lot of reading on this and have not found a solution, so I am pleading for help. I've read it could be feedback from the alternator. I've unplugged the wires from the alternator and it continues to run. The only way I can get it to cut off is to remove one of the cables from the battery and then unplug the wires from the alternator. As soon as I do both of these things it kills the engine. Just doing one does not. Does anyone have ideas on this problem that I can look for??