on to the next issue with the 600 grizz

So I’ve worked out all the mechanical kinks. now I’m have fan issues. I took the bike four a 2 he ride today. and it was great climbed some rocks and such. I noticed my oil light came on. then I noticed the fan never came on. I checked all the connection s and every thing is connected. now where do I start? Oh and I straight wired the fan and it works