Originally posted by semper
So the jest of it all is that unless I put a load/resistor on the 5V rail, I won't get 12V out of the 12V rail. But sticking a charger on the 12V rail will not having any adverse impact beside the fact that the Voltage may drop to a useless level... Does that sound about right?
Yeah that's right except you may also damage the charger because many modern computerised chargers don't like being plugged in to unregulated (ie switching) power supplies.