This document on automotive transients is a good read: https://www.electro-tech-online.com/custompdfs/2012/08/autotransients-1.pdf but might be over your head. The document effectively says you have spikes from -100 to 300 V in a automotive environment:
Negative spikes occur too because of the decay of the alternator rotor coil.
Negative spikes occur too because of the decay of the alternator rotor coil.
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