I Need your input please . I have a 2014 xp4 900. I recently installed a new battery Napa 30 lbs sealed battery. After riding 2 hours in the trails, the battery voltage keeps dropping until 10v. After turning engine off, it won’t start. I noticed the aux fan won’t come on and temp will rise when voltage gets low.
What is causing my voltage to be low. How can I test my VR if it’s bad.
Any advise is appreciated.

Thanks
Alex