BMW 740i car won't start or power on after new battery installation, with fuses and wiring checked on BMW 740i

Some BMW 740i owners report experiencing starting issues after a new battery installation, even after checking fuses and wiring. These problems may stem from the need to properly reset the Engine Control Module (ECM) or Engine Control Unit (ECU) following the battery replacement. Additionally, owners may encounter battery and electrical system issues, such as improperly connected or faulty batteries, which can prevent the vehicle from powering on. Faulty fuel or ignition components are also common culprits that can hinder starting, necessitating thorough checks of these systems. Furthermore, some owners have reported crankshaft or camshaft sensor failures that contribute to starting difficulties. Loose or corroded battery connections can disrupt power flow, making it essential to inspect these connections. Lastly, incorrect battery installation can lead to significant starting issues, highlighting the importance of proper installation techniques. It is advisable for owners facing these challenges to methodically troubleshoot these potential causes to restore their BMW 740i to proper working order.