Neg Batt Terminal Spark

Look you can't just stick your probes on stuff. You have to do this RIGHT

You sure you know how to set your meter up for current? This varies meter-to meter. If you post a photo of the meter and or the brand/ model number we can sort that out

There is only ONE way to measure current draw PERIOD

You REMOVE the negative cable from the battery. You connect one probe to the NEG battery clamp and the remaining probe to the battery NEG post

If you are actually really only measuring 2.*** milliamps that is a VERY small draw.