Gm ignition switch question

[348tripower]

Does Gm build the a diode into the switch to shut down the alternator? I have just run into the "won't shut off" when you turn off the key. The only other time I ran into this was when I changed my 9n Ford tractor to a alternator. I have a late model gm column with the switch on it. I have just jumped wires on the column to get this to run. I have not wired it properly yet.
Don

[Jokester]

If you hook the idiot light wire to the accessory side of the switch instead of the ignition side, the problem goes away.  No diode needed.

.bjb

[348tripower]

If you hook the idiot light wire to the accessory side of the switch instead of the ignition side, the problem goes away.  No diode needed.

.bjb

Thats what I thought!  
Thanks

[butch27]

I hooked to the "acc" side AND used a diode per Frank.