Ok, I did do this before posting but that was right after I freshly charged the battery overnight. Could mean the reason it wasn't drawing any more voltage. Will check again.
And just wanted to let you all know that we replaced the exhaust and muffler with a new one from the factory. Runs so quiet now I can hear the tranny whine (I hope that's a good thing, kart seems to still be working like normal!). Turns out the muffler was indeed falling apart - there was a metal plate just lying inside the muffler, rattling up a storm whenever I'd shake the muffler. No wonder my kart was making so much noise.
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