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        Thanks guys. The diagrams are very helpful. My alternator is wired as self excite according to the diagram. I need to spend some time tracing from there.  There is a confusing array of wiring behind the rear start panel that I need to trace out. Should have the engine running again in the next few days with a re-cored radiator.  That should help. But first I’ll trace out some of this wiring. What does a battery isolator look like? Is it a diode assembly essentially?