Most of the people converting them are using the 12 volt output( unregulated),so any load you put on it, causes the voltage to drop below a usable level. So you must put a dummy load on the 5 volt output( regulated)to keep the 12 volt output up . A couple of amps is fine( 10 -15% of the 5 volt rated output works). I use two large power resistors, but many use light bulbs.
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