I'm assuming it's a multi-meter? Can you measure the resistance of the wire on your cutting bow, from clip to clip NOT with the power supply hooked on just from where you clip your power cables to.
Also, be aware most Multimeters have two amperage measurement inputs that are seperate from your Voltage, Ohm, diode test hookup. These are all marked in Red usually with the one common being a black socket for your black cable. Low amperage (300 ma in my Fluke) goes through one socket any other current up to 10 Amps goes through the other. When you put the meter in either amperage reading it disconnects the Volt Ohm diode test port and reads from the other two ports. If you don't change your lead it should read nothing. Change to the High amp port first to make sure you are not trying to measure anything over the low ports capability. Put over 300ma in my low port and you'll smoke a fuse. Go over 10 in the High port and you'll smoke a different fuse. Important to read the meters instructions. We need to measure your load so we know what the amperage should be. If it acts like an old lightbulb the resistance will go up a bit when hot but base load should tells us how much your dealing with.