Why Is My Brand New Battery Dead. Hold engine at about 2500 rpms and test the voltage at the battery terminals. Remove the positive battery cable and put a volt meter between the cable and battery.
Giving the battery a charge every 12 weeks is a good standard to follow. Or there is some drain on the system. Try disconnecting the battery for 20 minutes and reconnecting the battery.
If there still is no power and all connections are tight then the fuse box could have a short causing the power to revert back to the battery.
Mine was a loose grounding wire that over time burned out the rectifier which screwed up the alternator and kept frying my battery. Hold engine at about 2500 rpms and test the voltage at the battery terminals. Your battery will drain faster when its connected to your vehicle than when its disconnected. After buying a new battery car after a couple of days went to start and battery was dead flat after having it charged it was flat after a couple days found the problem was shorted diodes in alternator was draining 5 amps Replacing new alt.
