I have not done any wiring on this rig. I am also not sure what you mean by a relay zooming sound. From your description it sounds like your battery is gone. Check it with a meter if you have one. I would check again to make sure everything is grounded well and all connections are good. It could be a coincidence that it went at the same time you did the power steering, but probably not. The relay I think is buzzing/chattering because it's not getting enough voltage. That is why switching relays didn't work or at least a possibility. Good luck.
A forum community dedicated to Can-am Commander side-by-side owners and enthusiasts. Come join the discussion about performance, accessories, specifications, modifications, troubleshooting, maintenance, and more!