You could, but it's a bad idea to disconnect it while the engine is running. The alternator needs a battery connected to work properly. Running it without one could damage the internal circuitry. You also run the risk of getting your hand caught in moving parts. However in some extreme conditions when the engine can't be turned off, here is the correct method. Connect a spare battery to the car using jumper cables. Take care not to knock the clamps off while you install the new battery. Once installed, it is safe to remove the cables.Can a car battery be changed while the car is running and if so how?NEVER attempt this at any time. Way too dangerous. If you need to change the battery...shut the car off and do it the normal and safe way. I assume that it will not start back up....ie bad starter, once you change the battery and that is your reasoning for wanting to change it while it is running? Please don't attempt this. Most auto places will change your battery, free of charge, if you purchase the battery from them. Much safer for you this way since you don't seem to have done this before. If the car won't restart you will be at the shop for them to diagnose it and repair it for you.Can a car battery be changed while the car is running and if so how?Yes, the car will run off the alternator.
Disconnect the Neg -, then the Pos +.
Install new battery Pos + first, then Neg -.this will keep the circuit open if you accidentally touch the frame.Can a car battery be changed while the car is running and if so how?why would you the alternator is putting charge into battery if it's running just make sure all acc. are turned offum it can but its not going to do any good the car is going to shut off while changing it....so you might as well shut off the car and change it..you can but you risk basically shorting out your entire electrical system.why do you need to leave it running?whats the point?
