They would be +5v, +12v and ground. Usually the wires are colour-coded, 5v
is red, 12v is yellow and ground is black. I would test the voltages on the
internal connector first, as it might not be the power supply at fault.

If the drive's not spinning up, it could be a case of 'sticktion' which can
be fixed by a sharp torque applied to unstick the rotating platters.

Simon.

"Jack Countryman" <jcountry@mac.com> wrote in message
news:3A97262F.66F4@mac.com...
> I have a Quality Computers 40 meg external Q drive here, off a friend's
> IIGS.  It had stopped working, and doesn't seem to spin up.  I suspect
> the power brick to be dead.  To test that, I'd try using an external
> power supply to power the drive...if I knew what voltage to hook to each
> of the three connectors inside the case.  They are not marked, and since
> there is no power there, I have no way of telling what voltage goes
> where to feed power across the pc board to the notebook size drive
> used.  Ideas, anyone?
>
> jcountry@mac.com