72 911T won't switch off!!

[joe_72T]

Hello all,

Took it for a spirited run today. Started fine, ran great but would not shut off. I actually turned the key and removed it from the ignition switch but the car kept running. I pulled the main wire from the distributor to shut her off. Waited about an hour or so and tried again with the same result.

I'm not a wrenched but it sounds like I need to replace the ignition switch? Thoughts???

Tx in advance.

[john walker's workshop]

a single filament bulb in a double contact socket in the brake lights can do that sometimes.

[joe_72T]

Wow. I haven't touched my lamp bulbs in years but I will check. Thanks

[haycait911]

sub'd. same problem, same year car.

[rsscotty]

This is common with cars that have MSD ignition boxes. They have a tech article on the cure. A simple diode installed in the alternator light circuit is the fix. It works.

[haycait911]

Originally Posted by rsscotty

This is common with cars that have MSD ignition boxes. They have a tech article on the cure. A simple diode installed in the alternator light circuit is the fix. It works.

and I have an MSD

I'll look into it. thanks.

[Wayne 962]

I'd start with the ignition switch first - we sell a ton of them for this reason. The other things are good to try after the switch has been replaced.

-Wayne

[haycait911]

Originally Posted by Wayne at Pelican Parts

I'd start with the ignition switch first - we sell a ton of them for this reason. The other things are good to try after the switch has been replaced.

-Wayne

I'll start with the switch. thanks Wayne.