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The dash voltage gauge should show the relative voltage coming from the regulator. If it's more than a third of the way into the green it may be too high. You can measure it directly by pulling the lead from the gauge and using a multimeter. I'm not sure if you can start and run the M37 on...

Before you do much more you might want to check the voltage output at the regulator. The generator output varies a bit but is smoothed out and regulated by the regulator to supply 24V to the coil. If the regulator is out of whack and putting out too high a voltage, then the coil is being...