During engine start, if the BAT DISCH caution illuminates on the CAD, what corrective action is required?

• A. No action is required
• B. Check charging circuit
• C. Reset caution
• D. Replace battery

Answer: (A)

During engine start, the battery is delivering a heavy surge of current to crank the engine and power other systems. A BAT DISCH caution on the CAD can light up as a normal transient during this cranking period, because the battery is effectively discharging under load while the starter is engaged. Once the engine starts and the alternator takes over, charging begins and the indication should go out. Because this is expected behavior during starting, no action is required. If the warning stays on after starting, that would signal a problem with the charging circuit or the battery, and you’d then investigate those systems or reset/replace components as appropriate.