Looks like the only pair from the read/write head that has continuity is yellow-black. Which, if I understand the forum64 thread correctly, is the erase coil. :(
[ On that note, I must say that the schematics are deeply unhelpful as the scrambled order that they’re in there, don’t actually match the jumper’s pinout. ]
The deeply shi**y part about this entire situation for me, is that I think I actually had continuity before I powered the 1541 on.