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Sure. The alternator is back-feeding the ignition system through the "excite" circuit. This would be (I'm guessing) a Delco 10SI alternator or similar, with a single screw terminal and a two position faston connector? From the connector on the alternator, trace back the wire that goes to the ignition switch. This would be the one which contains the "side marker light" in your schematic, which acts the same way as the "idiot light" in the dashboard of a car - it's supposed to limit the current which can flow in the "excite" circuit and shut down the regulator inside the alternator when the motor stops. In this wire, install a 50 volt, 1 amp diode, about $0.75 from Radio Shack. Install this so that the arrow on the diode package points "towards" the alternator. If this wire already contains a lamp or resistor, remove it and put the diode in its place. What this will do is allow current to flow to the alternator (to "excite" the regulator and start the generating process) but it will prevent current flowing in the other direction, from the alternator back to the ignition switch and so through to the ignition system. GLWI. llater, llamas
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