Master Ben King . . . . .
NOTE: I can have used a multi-meter but I cannot afford a 50 dollar one that accepts high amperage inputs.
The next step up would be a meter that commonly accepts 10 amps . . . but that is
STILL being inadequate.
Sooooooooooo what you want is a do it yourself creation of a high current series resistor . . . being called a current shunt in this case.
Build up the circuit below using those ~ values of resistance or multiple paralleled resistors to get that / those values.
Ideally you would want a combined total 10 watt resistor but just take your reading as quickly as a reading can display itself and disconnect. . .only then, you would be able to use a combined lower wattage value . . .say 1 thru 3 W.
If you successfully do that , that will prove to us that you know how to take current readings and , more importantly, how to get an ATA power supply to even come on.
THEN we can make a do it yourself meter shunt to replace that initial test resistor . . . which is to be used for calibration, later on.
We will be needing about 10 ft or so of that CAT-5 wire that you have strung all around the bench
to then wind yourself a 0.1 ohm ammeter shunt.
The end result will be your having the capability of reading 20 amps or more, as it is being displayed on the low DC voltage scale of your cheeeeeep DVM.
Thassssit . . . . . .
Reference . . . . .
73's de Edd