Doesn’t turn off when I turn the key to OFF position

[slappo]

So I just installed a new 130 amp one wire alternator and went to take the fury (1966) for a drive. When i pulled up to the gas station I turned the key to the left and the car remained running. I ended up inserting the key back in and leaving the key in the off position and after a couple minutes it shut off. Is this something simple like replacing the ignition tumbler and ignition swtch?

 

[darth_linux]

My first guess is that you need a new ignition switch.

 

[live4theking]

Did you change wiring to go to the single wire alternator? My father who was a mechanic for 50 years always said check the last thing you changed when there is a new problem.

 

[413]

Your stock wiring will be unhappy when that alternator puts out 130 amps.

How did you wire this in, what did you change. Look there first. Doubt anything is wrong with the ign switch.

 

[Big_John]

When you downgraded to the single wire alternator, chances are you are getting some sort of electrical back feed into the ignition system.

 

[slappo]

tried changing the ign switch, didnt work. Im thinking now Im getting feedback from the new alternator. The car will now shut off after about 2-5 min. Found this a Painless wire alternator diode for feedback. Should come in next week so ill install that next

 

[66 Monaco 500 365]

Sounds like the output is wired to the ignition side of the switch to me
My $.02

 

[slappo]

Sounds like the output is wired to the ignition side of the switch to me
My $.02

not to sound stupid, but could you explain this to me simpler. Like your talking to a five year old on ADHD meds

 

[slappo]

- the red wire on alternator goes to the summit cut off
- black wire on alternator goes to firewall junction
***tried putting the diode on the black wire but the car wouldn't start , so i removed it

 

[66 Monaco 500 365]

the big wire should run directly to the battery.
If the alternator output is connected to any wire that normally doesn't have power on it when the ignition is shut off, the power from the alternator will feed the ignition system, keeping the motor running. Our normal alternator's field (the regulator wiring) is shut down when the ignition is turned off, a single wire alt that doesn't have an exciter wire always puts out power if it's spinning, no matter what.
I hope this makes more sense.