Jooseppi,

There should be no need to test current draw on an item like that. To measure current you will have to disconnect the circuit and put your meter in series. Determine what current you are looking for, so that you can ensure that you have a meter heavy enough to handle the current. With an analog meter you will also have to be DARN SURE that you get the polarity correct, or you can blow the meter.

A simple way to measure current is to get a high power, .1 Ohm resistor and put it in series with the circuit under test. Then measure the Voltage drop across the resistor and do the Ohms law math to determine the current.

Why are you wanting to measure current draw rather than just ensure that there is voltage to the component or point in the circuit under test?

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