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ugh, I'm an idiot.
I traced the black yellow to the fuel pump... it seems grounded when the fuel pump isn't running. The fuel pump gets power for about 3 seconds with key on and not running, then turns off. I was checking after the 3 seconds. For anyone searching this in the future, on the s13 the black/yellow goes from the battery, across the rad support, up the fender, into the dash and through the SMJ, down the side into the trunk and across the tail light panel to the tank plug.
Turns out my IACV problems were probably from tuning around a crappy old IACV; I changed the minimum opening time from 25% to 0% and now it's idling like it's supposed to.
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