How can voltage levels of a fire apparatus be checked?

Observing the voltage meter on the dashboard is an effective method to monitor the voltage levels of a fire apparatus. This built-in gauge provides real-time feedback regarding the electrical system's status by indicating the voltage output while the apparatus is in operation. Typically, a healthy voltage level for a vehicle’s electrical system hovers around 12.6 volts (when the engine is off) to 13.7-14.7 volts (when the engine is running), which helps operators ensure that the battery is charged and the electrical system is functioning correctly.

While other methods such as measuring battery terminals or using a digital multimeter can also provide valuable information, they may require more technical knowledge or manual intervention, which might not be practical for operators needing quick status checks during operations or maintenance. The dashboard voltage meter is designed for ease of use, making it the most straightforward option for monitoring voltage levels at a glance.