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I worked closely with two experts in the aviation electrical field a while back. The issue of voltage spikes is a big concern in the aviation community because you don't want a spike to destroy $50,000 worth of sensitive avionics if a simple diode can prevent it.
They tried repeatedly to create one in numerous aircraft under strict scientific testing and could not. That doesn't mean they don't occur, but they were sufficiently satisfied that current generations of personal and commercial aircraft are sans diode protection.
I admit that this doesn't necessarily transfer to automobiles where the comformance to strick electronic standards for component parts is probably less rigorous. So install a diode and drive happy.
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