I researched some of this a year or more ago when building an automotive PS 
for a Mini-ITX motherboard.  There were some Intel, IBM and other docs that I 
found with pretty good details on the power-supply.  AFAIR, the grounds were 
all common.

Cheers,
-Neil.



On Monday 26 September 2005 11:09 pm, John Pearson scribbled:
> I want to convert my Dell ATX power supply to the standard power plug
> pinout. So I need to add the 3.3 volt lines to the main plug. I noticed
> that the 3.3volt lines have their own ground.
>
> Does anyone know what pin on the standard ATX power plug is the ground for
> the 3.3 volt lines?
>
> Thanks
>
> John


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