CHANGCHENG Motorcycle LED Headlight Kill Switch Talaria Plug and Play 12V Head Light Switch Aluminum Water-Resistant for Talaria Sting MX4 Electric Dirt Bike

I got this one and it worked flawlessly headlight switch For Regen make sure your battery is under 90% otherwise it doesn't kick on. As soon as you hit 89% it kicks on. If that's not the issue then I'm not sure. But I remember when I first got my bike I was confused why it didn't work either. I typically run mine on 2, not for battery Regen but more for saving my brakes a bit