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.

One of the simplest tasks a digital multimeter can perform is a basic voltage test on a car battery. Positive and negative terminals, hooked up to the car or not, will give a base number.

If you don’t see any coolant in the reservoir, or at the top of the radiator, add coolant to your system and run the vehicle ...