It may well be, David. There's no picture or description in the manuals I have. They just say that no maintenance is required on it. The wiring diagram shows it installed between the booster coil and the magneto so I assume it sparks when the booster coil is firing.
It puzzles me what it would be isolating, unless it stops the magneto back feeding to the booster coil when the engine is running.
Can you post a picture?
Malcolm
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