Wiring diagram for the 20 pin connector

[Akarom1234]

I have an old power supply; 235 watt unit. It works fine as long as its plugged into an old system I have. I want to know what I need to do to turn or activate it without being it plugged in to the motherboard. What I plan to do is use the 12v rail to supply a car radio for my workshop. Does anyone know where I can find a schematic for the wiring of the 20 pin connector or have the schemaltic? Any and all help are appreciated

 

[Jhhnn]

Jumper the only green wire in the connector to any black, ground. the yellows are your +12v...

 

[Akarom1234]

I jumpered the green to one of the black terminals but my power supply only give 11 volts. when I checkthe voltage while the 20pin was plugged into the motherboard I get a full 12 volts. What does the green wire do or come from? would the green wore need to be grounded through a resistor? If so what would you recommend?

 

[Jhhnn]

You're only getting 11 volts because you haven't supplied a load for the voltage regulation circuitry to work properly.

This article (long) goes into very good detail as to how psu's work...

http://www.pcguide.com/ref/power/sup/index-c.html

 

[Chaotic42]

This should help.