When the red light on a battery charger blinks that is a sign that something is wrong with either the charger or battery pack. Since in this case the red light does not blink when the charger is plugged into the wall and not plugged into the hoverboard that indicates that the battery charger is most likely working properly and that the problem is most likely with the charger port or battery pack.
A battery charger with blinking red light when plugged into the wall only could indicate one of these problems:
A battery charger with blinking red light when plugged into the wall and scooter could indicate one of these problems:
I would start by taking the shell off of the hoverboard and checking the charger port wiring and connectors, and also checking the battery pack wires and connector to make sure they are in good condition and are properly seated where they plug into the control module.
Where can I find a wiring diagram?
Found a loose wire black and red that leads to a white plug in. Clips in somewhere?
I faced similar issues from one hoverboard I purchased, what they told me was, that i have to keep it plugged in for 15 mins even if it does not charge, after 15 minutes it will start charging. It worked for me.