$5.$ ELECTRICAL MALFUNCTION $-$ LOW VOLTAGE ON The GROUND.a$.$ Voltmeter indicates significantly less than $14$ volts during normal ground operations with the engine running.b$.$Voltmeter indicates significantly higher than $14$ volts during normal ground operations with the engine running.c$.$ Ammeter indicates positive during ground operations with the engine running.d$.$ Ammeter indicates zero during ground operations with the engine running.