Battery not being charged, how can I be sure it's the alternator?

There are a few reasons why a battery might not be charging. Here are a few things to check:

1. Make sure the charger is plugged in and turned on. This may seem like an obvious one, but it's worth checking to make sure that the charger is properly plugged into an outlet and that the power switch is turned on.

2. Check the charging cable. Make sure that the charging cable is properly connected to the charger and the device. Try using a different charging cable if possible.

3. Clean the charging port. Dirt or debris can build up in the charging port, preventing the device from charging properly. Use a can of compressed air to clean out the port.

4. Try a different charger. If you have another charger that is compatible with your device, try using that to see if it works.

5. Check the battery. If the battery is damaged or faulty, it may not be able to hold a charge. Try replacing the battery with a new one.

6. Restart the device. Sometimes, a simple restart can fix charging issues. Try turning off the device and then turning it back on.

7. Update the software. If there is a software update available for your device, install it. Software updates can sometimes fix charging issues.

8. Contact the manufacturer. If you have tried all of the above and your device is still not charging, contact the manufacturer for further assistance.