1. Check the power
If your MacBook charger is not working, it won’t charge your MacBook’s battery. So you need to make sure the charger is working fine.
Check the power outlet
First, you need to make sure that the power outlet is ok. You can plug a lamp or an AC-powered clock into the power outlet. This simple step lets you know whether the power outlet is working or not.
Check the AC power cord
The MacBook charger comes with a removable AC power cord. Check the power cord for wear and tear. Insert the plug into the wall outlet firmly. Don’t forget to check the power cord on the charger side. Make sure you insert the power cord into the charger firmly as well.
Check the DC cable
Next, carefully inspect the charger’s output cable, starting at one end and working your way through until the other. Look out for any fraying or tears in the cable. If flaws are similar to those shown in the photo below, this is likely the problem. Replace the charger or try another available charger. 
In addition, the USB-C charger uses a removable USB-C charging cable. Make sure the USB-C cable is fully inserted into the charger. Believe it or not, these simple checks often fix the MacBook battery not charging issue.
If your MacBook starts charging when you wiggle the USB-C cable, the cable is not connected properly. The removable USB-C cable is prone to get damage by bending the plugs at the two ends. Stop using the cable immediately and get a new replacement cable.
Check for charger overheating
The MacBook charger can become warm during normal use. If you place the charger in a poorly ventilated area, such as on a sofa, bedding or a pillow, the charger may turn itself off if it gets too warm. Unplug the charger immediately and let it cool down before using it again.
Check for AC line noise
The AC line noise from power tools, fluorescent lights, refrigerators, and other sources may interfere with the MacBook charger. The charger will shut down when it senses too much line noise from a socket.
Usually, the line noise won’t last long. Unplug the charger, wait for 1 or 2 minutes and plug the charger back in to see whether the charger works or not. Other solutions include using an uninterruptible power supply (UPS) to filter out the line noise or plugging the charger into a different circuit, eg., the other side of a house or office, upstairs or downstairs.
If your charger keeps turning off, you most likely have a faulty charger. You need a new charger.
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