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.