AT Power Supply Question for A1200

[badgerme]

How do - I've got an AT power supply rated at 200W with an AT to Amiga adapter cable to connect the Amiga straight to the power supply. Question is - when the AT PSU was in a PC - there was a cable that connected the case to the mobo that turned the PSU on - how do you turn the PSU on without the motherboard? (Its definately an AT PSU and not an ATX)

[badgerme]

there is a black cable hanging out of the power supply with connectors which connect to the power supply switch. The colours of the wires are black, brown, blue and white. The diagram indicates on the PSU that the all four connect to the same switch.

It also says on the diagram that the L (live im assuming) is switched by connecting the black and brown wires, and the N are switched by connecting the blue and white wires.

It appears that the two sets of wires are connected to each other when the power supply switch is switched on.

Unfortunately I don't have the switch - the PSU didnt come with one

Can I simply just connect up the black to the brown wire, and the blue to the white wire permanently for it to turn on or does it need a proper PSU switch?

[badgerme]

okie dokey - got it working with the switch. Have shorted the blue/white (neutral) wire, and then switched the brown/black cable. Nice AT power supply conversion! Hope you don't mind but I've adopted the layout with the switch - bloody good idea!

Ok - heres the thing, the +5v and +12 rails read well within the +-5% range, yet the -12v rail is 0.1 volts too low - do you think this will matter? This makes it 5.83% in range? What do you reckon guys?

Also on another note - I thought I'd stick a multimeter across my A500 power brick to see what it was reading. Turns out the minus 12v rail (-12v) on that is -18v!!!!! how the hell has my amiga survived all this time? Should I continue using it??