How To Check Charger Amp With Multimeter. Attach the test probes of your multimeter to their corresponding ports. You have to load the charger and put the multimeter in series as if it is a wire the indicated value on the charge is the rated current the current flow depends on the load resistance Ohms Law.
If the battery is removed from the car connect a two-foot piece of battery cable to the negative terminal. Remove the red and black probes to shut off the multimeter. Connect the positive probe in the outlet marked Amp.
This varies meter to meter.
1 if your phone charger is nominally 5V1A then you can find a 5 ohm 5W resistor as a load resistor. Attach the test probes of your multimeter to their corresponding ports. Remove the red and black probes to shut off the multimeter. When the leads are separated the reading should be 1.
