Another method is to use hall effect current sensors:
30 Amp AC or DC
75 Amp AC or DC
Just read the DC voltage output of the sensor with your DMM and do the math to determine the current flow.
I use a old fashion current shunt like the below to measure higher AC or DC current by just reading the millivolt voltage drop across the shunt with a DMM and then some basic math. Works for AC or DC readings.