I think we start with the fact the bike was working properly before you installed the heated grips. You maybe hooked up either into an incorrect circuit or installed backwards and are creating a short.
I would start my diagnostics by disconnecting you recent wiring job and see if it then is able to run. Then recheck your work.
I would start my diagnostics by disconnecting you recent wiring job and see if it then is able to run. Then recheck your work.