yah that is a decent voltage drop, I've gotten many mixed reviews regarding usage of a capacitor for car audio systems. I agree adding a higher output alternator and a stout battery would be indefinitely be a wise choice. i'm just a little confused why the capacitor is considered a "band-aid", ive seen mixed views on this subject but i would still consider one based on the electrical research I do at work. I think many people do not match components and/or do not understand may be the primary issue here. I can see caps used in car audio systems easily having a capacitance over or under rated for the job they need to do. I look at dV/dT 's (change in volts over change in time) of charging and discharging curves, associated instantaneous maximum current ( I= CdV/dT and ), and wattage calculated from this.
I do like how you utilized the stock clock as a dvm. I would only have one suggestion, swap out that electrical tape and get yourself some epoxy and "pot" / dip / coat the circuitry that you want to be insulated. It will hold up very well!
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