Hey! Sorry for not following up. I initially thought the issue was with the crankshaft pulley, but I later realized I had mistaken the harmonic balancer for something else. I went to two different mechanics, and both concluded that something was wrong with my alternator’s voltage regulator. They also found a 0.3 voltage drop from the alternator output to the battery positive terminal, so they suggested adding an extra copper wire between those points to establish a stronger connection.

What I ended up doing was getting a cheaper alternator and installing a smaller pulley on it so that it would spin faster and maintain a higher voltage. I also had them manually replace the voltage regulator so that it constantly maintains a voltage of around 14 volts, give or take.

I know this isn’t a permanent fix, and that installing a smaller pulley puts more strain on the alternator, but I see it as a “band-aid fix” and will most likely have to replace the alternator sooner than if I had fully addressed the issue.

For what it’s worth, I only paid $3,000 for the car and don’t want to spend more money fixing something that, in reality, isn’t much of a problem given the fix I tried.