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Lots of us have the 24v start, but have bypassed the resistor bank to feed 12v to the GPs, to avoid cascade failures. Of course, Rick (cucvrus) sneers at us, since he's never had a problem and he can recognize when one GP is going bad, and just changes the bad GP right away. So, either way works.

Well, it's not accurate to say that it switches, but yes, it does drop from 24v to 12 when the current flows to the GPs. That is correct. Exactly right. With each failure, the voltage applied to the remainder goes up, which means they get hotter, faster, which shortens their life. That...