One of the cheapo relays (can't find that style of relay anywhere) in the harness wasn't fully engaging. It'd click but not as loud as the other one. So I swapped in 2 RL44 relays and now it works like it should. They also wired the low beam to the high beam output so they'd both come on at the same time. Triggering both relays, which I'm guessing is the reason the low beam relay failed/failed to engage completely.
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