Beats solo 3 will only flash one red light after being plugged into charge

Hi there chjewa1961,

Thanks for using the Apple Support Communities. I understand your Solo3 Beats are not charging as expected. I’ll be happy to help with this.

First, try resetting your Beats:

1. Hold down the volume down button and the power button for 10 seconds.
2. When the Fuel Gauge flashes, release the buttons. 

You may also want to try charing using a different power source and cable as well. Let them charge for about 20 minutes and see if there is any change. You can find details on these steps here:

Solo3 Wireless Headphones Support

If those steps don’t help, your Beats may need service and you’ll want to reach out to Apple Support using the following link to continue to look into this with you:

Contact Apple Support

Best wishes.