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You can test alternator diodes with an oscilloscope and a coil on plug inductance ignition probe. All you have to do is touch the C.O.P. probe to the back of the alternator and it will display the voltage ripple pattern. I should have inverted the pattern, but it does show a good ripple pattern...

Here are some pictures I have of the external IVR and filter capacitor (condensor) mounting. The capacitor has a spade lug on the end of its lead that plugs into the middle slot on the PC board. When the capacitor is properly mounted, it will usually only reach the correct slot. I hope this will...