If the engine doesn't start within how many seconds should you release the starter switch?

Releasing the starter switch after 30 seconds is critical to prevent potential damage to the engine and the starter motor. When attempting to start an engine, especially in emergency vehicles like fire service apparatus, prolonged engagement of the starter could lead to overheating and serious mechanical failure.

A starter motor is designed for intermittent use and has a limited duty cycle. If the engine does not start within this timeframe, keeping the starter engaged can cause excessive wear or failure of the starter itself, and may also drain the vehicle's battery.

In practice, if the engine fails to start after multiple attempts, it would be advisable to check for other issues such as fuel supply, electrical connections, or mechanical problems rather than continuing to turn over the engine unnecessarily. It is essential for operators to be trained to follow these protocols to ensure both the longevity of the vehicle and reliability in emergency situations.