For automotive circuits, we recommend an auto-ranging meter with at least 20MΩ of internal resistance. Make sure to use the correct multimeter setting for a car battery.

For all of you who have a multimeter thrown in a drawer or toolbox but don’t know how to use it, these instructions will help in your search for missing voltage.

Tips If your power supply does not appear to have any problems after testing it with the multimeter, check all of the power connectors to make sure they are properly plugged into the devices.