At what voltage below 24V will the engine fail to start?
2 Answers
24-volt batteries below 21 volts cannot start the vehicle, while above 22 volts can generally start the vehicle. Here are the relevant details: 1. Voltage: The starter motor requires sufficient current and voltage. If the battery is depleted, causing the voltage to drop too low to start the vehicle, a new battery replacement is necessary. 2. After starting the engine: The engine drives the generator, which powers electronic devices and recharges the battery. During charging or discharging, ions in the battery move through the electrolyte, and some ions undergo chemical reactions with the electrolyte as they move.
Having driven large trucks for many years, I know that if the 24V system voltage drops below 20 volts, starting becomes difficult. The starter doesn't have enough power to turn the engine, especially noticeable in cold weather. Low voltage not only prevents starting but can also damage the battery and electrical circuits. There are various reasons: aging battery, insufficient alternator output, or corroded connections. Normally, you can measure the voltage with a multimeter. The standard when stationary is 24-26 volts, and if it drops below 20 volts during startup, you should be alert. Regular battery maintenance and cleaning terminals can avoid the hassle of breaking down on the road, saving time and money on towing. If the voltage consistently falls below 19 volts, seek professional repair immediately—safety first.
