I have a sportsman 500 that i can never win with. My speedometer stopped working about 5 months ago and ever since i bought this ATV the 4x4 has ben switching from working and not working, most of the times I've fixed it by cleaning up the terminals in the switch but this time it didn't work. looked around the internet and all other posts about it state that when the speedo stopped working the 4x4 stopped directly. but my 4x4 has ben working "sometimes" I've tried the brown and white grounding trick and that did not work, I've checked the power going to the speedometer and there is power going to it. at this point i don't want to bring it to a mechanic until i'm sure i cant fix it. can anyone help me.