So among the PowerPC mainboards that I bought are two that I think are from a 7043-140 and one from a 7043-150. They do have a power connector that looks like it was the usual P8/P9-AT-connector (but it is not labeled like that, it is just called J7). Probing around reveals that the four middle pins go to ground, so that is a good sign. But then there is another single one of these connectors next to it. Three of its pins go to ground, so I guess it cannot be a P8 or P9 connector. And then there is another one of these connectors on the riser card as well. I did not probe this one so far though. Both of these additional connectors are labeled J8.

I did not find a datasheet for these PSUs, but here is one for sale: https://store.flagshiptech.com/ibm-40h7564-25 … y-for-7043-140/
The second picture kind of supports what I measured. There are two connectors that have three black and three green wires. So the question is, what voltage is supposed to be on the green wires?

Right now I just hope that someone knows this or has any documentation. But if that is not the case, I would really appreciate if maybe someone with such a machine could take a quick measurement.

Thanks for any help on this! 😀

(On a different note: This guy here on YouTube has a Motorola PPC board that has one additional connector that he simply did not connect and it does not seem to cause any issues for him. https://www.youtube.com/watch?v=ddOBOBZu_bg )