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Also, verify that from M- to B-, you have very large resistance, and when you precharge the caps, that it stays precharged. So there's not much leaking from B+ to B-. and that you have PH1 and PH2 soldered into place. And that you have all 10 gate resistors soldered in too. The MOSFETs have thicker legs, so yo can just see if the legs closest to the B- bar are thicker than the ones closest to the B+ bar.
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