Nissan Armada erratic battery gauge movement despite new battery and alternator on Nissan Armada

Some Nissan Armada owners report experiencing erratic battery gauge movement even after installing a new battery and alternator. This issue may stem from a failing alternator that fails to provide a consistent charge, leading to fluctuating gauge readings. Additionally, low or unstable battery voltage can contribute to this erratic behavior, necessitating a thorough check of the battery's charge. Electrical system malfunctions, such as faulty wiring or connections, have also been noted as potential causes. Some owners find that disconnecting the harness from the sensor on the negative battery terminal can resolve issues with the ECM not allowing proper charging voltage. Furthermore, problems with the starter motor or its circuitry may lead to similar symptoms, and trying different starting methods, like adjusting the transmission lever, might aid in diagnosing the problem. It is crucial for owners to systematically address these factors to identify the root cause of the erratic battery gauge movement.