atx to nonstandard molex pinout

I am trying to get an old arcade game powered up using a standard atx power supply spliced into a proprietarily wired 214 pin molex. I have attached the pin-out schematic of the board side of the proprietary harness. I have also attached a verbal description of said pinout. The atx power supply was known good before I cut. With pins 1 and 13 jumped the supply powers on. Pin 15 and 14 test fine but 20-22 test of OF. The way I have it wired now is one 5 volt  lead per pin but does this schematic suggest that my problem is that I should only be attaching one 5 volt lead in to all three.?
text-pinout.jpg
schematic.jpg
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pheidiusAsked:
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_Commented:
As far as I know, it shouldn't matter if you use multiple feeds or a single feed (provided the wire for a single feed can carry the needed current without melting).

Are any of the other 5v wires hot (like in the 4 pin molex)?
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nobusCommented:
i never saw 20 V coming from an ATX Power supply. pins 18-19 are GNd
to start a PS, you should short  pin 16 to Gnd
here the pinout :  http://pinouts.ru/Power/atx_v2_pinout.shtml
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pheidiusAuthor Commented:
Yes, you are right the 20v rail was from an nonstandard ps (actually a second Ps). It was used to run an external flashing light for a winner and a a scrolling advertisement led. I am not going to run anything to that as it is not needed anymore. Nobus you are right about short starting the atx standard. In this case, I took the green power on wire and moved it to the position that the proprietary engineers had moved it which was 13 in this case so the Ps starts when grounded in that wise because as far as it knows it is grounded on 16. I will try some different +5 volt wires. I wondered if there was any way I might have mixed up +5 v coming form the main harness with some from the peripherals. Do they have different internal gorunds? The OF puzzles me. If needed I can post the whole ps schematic as I am going to have to make a little in/out line in order to get the Power good signal back to that pin 13 to power the board once I figure out my awol +5. The external switch on ducked through a  couple of peripheral molexes then up though a vme bus to get to the board.
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nobusCommented:
>>   Do they have different internal gorunds   <<   it depends on the brand and construction; some have separaterate rails, some not. But you can tie all the gnd wires together

>>>  The OF puzzles me   <<  what do you mean?  what OF?
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_Commented:
>> ... the 20v rail was from an nonstandard ps...

ahhhh... I wondered how you managed that.   : ))
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pheidiusAuthor Commented:
Sorry about abandoning this for a bit. i had other fishes frying. I got OF as a readout on my handheld ememeter
when testing the five volt out.
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_Commented:
Not a problem.   ; )

>> ...OF as a readout on my handheld ememeter...

Never heard of an ememeter (and Google was not any help), but I take it that isn't good.
Did you try bridging all the grounds together? And making sure there is a good ground between the psu and the arcade game?
Do you have a regular voltmeter to try it with?
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nobusCommented:
and what do you mean with OF ??
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pheidiusAuthor Commented:
Sorry about spelling but yes; voltmeter is a more common name for the hand held tester I was describing.
As far as grounds  go, I did bridge according to one of the schematics I gave you. Tell you what I will post another schematic I have since found that putatively answers this question in terms of pinout conversion but where the picture of the ground jumping is so turned so that you cannot really determine the exact jumps.  

Modifying-a-standard-ATX-power-S.doc
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nobusCommented:
well - i don't see why the rearrangement of wires is necessary - unless the device connecter is like that
for the grounds  - those are on a pc power supply connected together in the PS self; but some do have complete separate rails; that is probably why he jumps every ground wire ( no harm doing that)
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pheidiusAuthor Commented:
ooo you are thinking he jumps every ground wire. I can see three lumper wires in the picture but maybe they are strategic. According to the "OEM" harness and the diagrams I posted above the pins 1-12 23 and 24 are all grounds. What pins would you connect to use three wires to jump the grounds? If it would help i can post the whole power supply schematic not just the pinouts.  
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nobusCommented:
maybe not every ground wire is jumped, but with the 3 wires he jumps thee ground of the rails
he says under it : Please note that Jumps of the ground cable will be required by most Power Supplies.
this means - with many it works without the jumpers.
but as i said above, no harm jumpering ground lines
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pheidiusAuthor Commented:
K, now I will experiment
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pheidiusAuthor Commented:
sorry guys i had top go to Florida all off a sudden. i will be on this monday,
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Wrong recommendation, should be    Delete/no refund
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