I have a 2006 Polaris Sportsman 800 Efi. The AWD is not working. I have changed the front diff fluid. My Speedo does not work. The only thing that works is the RPM, and all lights. My AWD light comes on but doesn’t engage. I checked the voltage from the battery and is 12v. I checked the voltage coming out of Speedo to front diff and is only 10v. Is my Speedo bad?