Motor keep running after shut down?

I replaced my alternator and voltage regulator today, and the motor still wont shut off, it is in a 1965 Buick Wildcat.
I do have an MSD ignition if that matters, but it use to work fine before.
I put an extra ground on motor. Any ideas would be helpful.
If i pulled the plug out of the back of alternator it will shut off, thats why I change it thinking it was the problem, but still did it again.o No:

Thanks for any ideas, Mark

 

What was your initial problem?
Did the engine start to run on and then you pulled the plug and it stopped, and you replaced the alternator and regulator?

 

Check your MSD instructions because you need a diode in line from the wire that triggers the alternator. The small wire that comes from the idiot light on the dash into the alternator plug. The MSD website should point it out. Very common problem.

 

Could be improper timing or idle mixture, or too hot of a plug.

Usually, it's a timing issue.

If you hold your foot on the brake and put the transmission in Drive,
and turn the Ignition key off, does the engine turn off immediately?

 

I was told by a friend to pull the plug on the back of alternator and see if the motor would shut off, so i did.
The motor still was running after the plug was pulled, and then I turn the key off and it shut down the motor. So i was told that i had a bad alternator so i replaced it along with voltage reg, and it still wont shut off.

 

Your "friend" is not in the know

 

I will try that, sound like good avenue to go down, Thanks

 

I know what you mean, but it not running hot, tried all that!

 

Prefect, I am all over that!

I will let you know Monday :TU:

Thanks Mark

 

Yep. sneak feed backfeeding the ignition.

 

Well I could not wait till Monday, just look it up at their Web Site and there it was Engine Run On they call it, So i found my MDS box and the little diode was still in the box, so I splice it in on brown wire like you said, And it all better! SHUTS RIGHT DOWN! :3gears:

Thankyou guys for all your help! :TU:

Im a happy man.

 

What do you mean splice it in? Do you have a pic of it spliced? Do you literally cut the brown wire and put the diode in between? It is so thin compared to brown wire. How did you do it?

 

Old thread
04-18-2010, 09:46 PM

Last time he was on was June 12.

 

Thanks Larry. I just like to always have pre planned just in case. I assume I will not need. I was just curious how it attached.