Kinda need to know which clutch it is. But most here are on riders and ZTRs have anything from 1.7 to 3 ohms resistance just depends on the size and manufacture.
I do know that even if a clutch sounds like it engages there are problems with them that make unable to fully engage mechanically. I had one such case here last year where the clutch would engage cold (initial operation) but after 30 minutes of mowing it would not re-engage if disengage yet the resistance was still within the initial range test range.
Also some electric PTO clutches are adjustable so it is one thing you can check prior to writing it off as the air gap maybe too much not allowing the spinning rotor to attract the armature plate fully.
Just if you install a new electric PTO clutch make you burnish it in following the manufacture procedure. If not available then use the Warner burnish procedure.