<<
On a four wire Molex power lead, one red, two
black, one yellow, is it 12 v red, 5v yellow, two black grounds?
>>

Japan Molex is used on PeeCee floppies and on SCSI Zips, only.

AMP Mate-N-Lock is used on everything else.

Numbering for AMP is ...

Pin 1 - +12 volts - Yellow
Pin 2 - +12 volts return (same as ground) - Black
Pin 3 - +5 volts return (same as ground) - Black
Pin 4 - +5 volts - Red

Numbering for Japan AMP is the reverse of the above ...

Pin 1 - +5 volts - Red
Pin 2 - +5 volts return (same as ground) - Black
Pin 3 - +12 volts return (same as ground) - Black
Pin 4 - +12 volts - Yellow

Note that PeeCee and Mac power supplies have a -5 volts and a -12 volts, so 
the correct terminology for pins 2 and 3 are "returns" for their corresponding 
+ voltages, NOT - voltage.

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