Re: How do I properly measure the current of power supply?

There was little progress.
I had an advice from few members in the Reprap irc chat which was to install a load in positive 5V rail.
So I installed two 10 ohm 10W resisters in parallel to the positive 5V rail.
The PSU was providing two volts higher than previous test: 10W resistor gave 12.18V, 55W light bulb gave 12.01V (previous value was 10.09V).
It lighted up two the 55W light bulb in series but again it failed to run the two light bulbs in parallel.

I read through Choosing a Power Supply for your RepRap to figure out what I have been missing.
( [reprap.org])

According to the first method, I skipped few steps:
installation of 47 ohm on PS_ON (green wire) and ground one
Soldering 3.3V sense wires

[reprap.org]

Quote

Another personal opinion: reusing an old AT or ATX PSU (instead of spending $30 to $45 for an inexpensive but new ATX PSU) is a most unwise decision - a lesson I have learned the hard way! ATX PSUs are dust magnets, sleeve-type fans (the most common type in old PSUs) become noisy and ultimately fail (and when they do so during a print, you'll definitely smell smoke coming out of the PSU), and electrolytic capacitors fail catastrophically (with smoke and a bang), sometimes killing whatever electronics you have connected to the PSU. Not only that, but ATX PSU circuits have very much improved in performance, reliability and efficiency in the last couple of years (2013-2014), so the few dollars saved when reusing old ATX PSUs in RepRap projects are just not worth the risks, hassle and time wasted.

Basically the wiki page wouldn't much help in my case because I'm using an used ATX PSU made in 2010.
What was I thinking. :S

PS:
+12V1 and +12V2 connectors