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Alright guys Ive got a s10 witha SBC in it. After you start it the ignition switch wont turn it off. When you attempt to do this there is a slight difference in the motor sound. I have changed the ignition switch but it just made it worse. If you watch the amp guage it goes the opposite way than normal when cranking. It has a newer starter on it as well as a noid. TIA
 

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Sounds like your getting feedback from the alt or i have seen the electric fan motor feedback also if it is wired to come on with the key.... Just 2 things you may check...
 

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I had a car that wouldn't shut off till the electric fan quit turning.LOL It was creating voltage like a alt. (same principle) I used a relay to power the ign. so it is isolated from all feedback. No worries. The diode works to (as MSD suggests)
 
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