UTV Stereo's Power Kit is the best way to run high current power and battery ground to your power sports amplifier. The harness has an in-line waterproof Maxi Fuse plus Battery terminals are sealed for protection. The best connection for any 12 volt amplifier is with this harness routed to the battery or high current buss bar. Length is 12 feet to cover all vehicles but the length can easily be shortened if needed.
Hit the link for detailed instructions: Polaris RZR Power Harness Instructions