Dieseling is not electrical, it is either an Idle set too high (should be set to about 450 or as low as possible running OK), or carbon hot spots making combustion happen. The not shutting off could be 2 things it needs a diode in the wire from #1 terminal on alt to the ignition, but it must block voltage from alternator and allow voltage to go to the alternator (diode band to alt side). The Delco while excited puts charging voltage on that wire which then causes the light to have 12v on both leads shutting off its illumination. The alt light could do this (stand alone) without the diode if it is a small wattage bulb. If it has been converted to electronic ignition, the trigger voltage could be as low as you found. Reverse the ammeter wiring and the meter will read charge when charging, if the delco is connected through it. or discharge if the delco is connected directly to the battery. Jim
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