Engine runs with Ignition Switch Off - Team Camaro Tech
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post #1 of 3 (permalink) Old Jan 7th, 06, 02:44 PM Thread Starter
Join Date: Dec 2001
Posts: 56
Engine runs with Ignition Switch Off

This is an 84 Z28 with a history of modifications under the hood, but here is the issue. The 84 has a three wire alternator like the stock alternator. Recently the alternator stopped charging and we noted that the alternator wire providing the 12 volts from the ignition was open. The alternator load or voltage sensing wire is hooked up to the positive terminal on the battery. I ran another wire from a spare ignition source off the fuse block to the alternator in place of the original factory wire. Everything now works fine again, except the engine won't shut off when I turn the switch off. Is this a case of not installing the appropriate diode in my new 12 volt ignition source wire from the fusebox, as other previous posts suggest. If so, I would take recommendations for the correct diode......thanks in advance.
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post #2 of 3 (permalink) Old Jan 8th, 06, 08:52 PM
Join Date: Jan 2006
Posts: 65
Re: Engine runs with Ignition Switch Off

Go to radio shack 50 volt 1-10 watt diode should do it.
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post #3 of 3 (permalink) Old Jan 9th, 06, 01:06 PM
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Join Date: Aug 2004
Location: PA
Posts: 819
Re: Engine runs with Ignition Switch Off

The original wire from the ignition goes to the alt. or gen. light in the dash, through the bulb and then to the alternator. If someone pulled the bulb or if it's bad that will cause an open circuit to the alt. It's worth checking. The diode method should work. Without it you run the risk of burning the wire you installed because of voltage back-feeding from the alt. to the ignition.

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