9v battery draw

Select milliamp setting on dial and making sure lead is plugged into proper milliamp jack insert test leads into circuit between battery and the terminal that it normally contacts. In other words the meter will complete the circuit. Red lead to battery positive and black to where it normally connects (load)

You may want to check the output jack of your guitar has a normally open switch that closes when its plugged in. Metal prong may need to be bent to suit.

 

Hi Scott,

The latter half of this video shows exactly how to measure current flowing from a battery. Basically you need to splice the multimeter in series with the load you are powering (in this case the preamp). Current measurement starts at 3:31

 

You may have a blown fuse in the back of your meter.

 

You may be able to ohm out the switch as well. If the input switch is closed while your cord is plug in and remains closed when unplugged this may tell you if that is the issue as well. Though probably not the switch you have the diagram below in the lower left shows an example schematic.