What is one common usage for a multimeter in vehicle diagnostics?

A multimeter is a versatile tool widely used in vehicle diagnostics primarily to check voltage and resistance, making it essential for troubleshooting electrical systems. When diagnosing issues in a vehicle, technicians often need to assess the electrical current in various components, such as batteries, alternators, and wiring. By measuring voltage levels, a technician can determine if a component is receiving the correct power. Similarly, measuring resistance helps identify shorts or open circuits within electrical systems, facilitating more detailed troubleshooting and repair.

The other options mentioned do not align with the primary function of a multimeter. Testing tires typically involves checking tire pressure or tread depth, which requires different tools such as tire gauges or calipers. Measuring fluid levels is usually done using dipsticks or sensors specific to the type of fluid being checked, like oil or coolant. Inspecting brake systems generally requires visual inspection and the use of specific tools designed for brake repair, rather than electrical diagnostic equipment. Hence, the use of a multimeter is specifically relevant to electrical diagnostics, underscoring its critical role in automotive maintenance and repair.