Deep Cycle Battery Charging From Alternator

MEXICOWANDERER wrote:
And do not forget to add the effects of the starter solenoid itself. A large field collapse can definitely be felt. It is a magnetic servo as well as electric contact controller.

This seems to be mostly what is found when talking about any kind of spike from starting due to anything powered off the starter switch during cranking and would be the same with a loaded or unloaded starting motor. Instead of a flyback diode on solenoid it seem a starter relay is used to drive solenoid and that relay may have built in diode, but its even smaller coil too. I would imagine in cars with remote/push button start there is transient protection on the solid state circuit controlling the starter relay.

I don't know maybe modern starters have flyback diodes since they are so easy to add but no one seems to talk about it or care the main issue seems to be arcing and RF not giant spikes like you would see from a load dumped alternator.

Definitely want to get a scope on my starter system and see how large the spike is at different point to see how well my batteries suppress it.