Just to comment also about this new Psu that I've bought (I've got four C64's). I think it has a good price and it also has a cable long enough:
https://www.ebay.es/itm/New-Commodor...YAAOSwYwJaDXiD
Edit: I've checked the continuity of the cables and it is ok with the pins now, but I can't check the volts of each line because my multimeter has a blown fuse and I'll have to wait for a replacement. In any case I've switched it on while connecting it to one of those new C64's power savers and the led turns on ok. I won't try it yet with the C64.