Take out the fuse and put it in slot of the AE150. Please make sure the circuit protection is correct . (The detection fuse of the tester is 20A/48 V, standard type)
Insert the plug of the tester into the vehicle fuse socket
If necessary, start the vehicle engine and energize the circuit first. Then turn on the detector by pressing the power switch
Under test, operate the circuit and the display will show the measured current
Turn off the tester by pressing the power button again when you finish the measurement