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Oh right you have ultracaps on your Acura. The way I imagine a simple passive balancing circuit for ultracaps is to have a "soft" cutoff shunt at 100% of the intended target threshold, allowing them to go out of balance by a bit under heavy current but eventually come down to the correct voltage. Since each cap can go well beyond what the alternator can charge them to at equilibrium and isn't damaged by low voltage either, it's safe to have it go out of balance temporarily.
For lithium ion batteries, the relationship between state of charge and voltage is not as simple, you want the battery pack to normally close to fully charged, and overcharging them is a death sentence to the cell, so I think the simple thing to do would be a high-current hard shunt at say 3.65V on a LFP cell. If all 4 are at 3.65V, you're at 14.6V, so there's no current flowing from the alternator and you're good.
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