Help- Blinking reverse light

Reverse sensor switch has failed. If you ride it now, it should hit the rev limiter, even in forward gears.

I have replaced it

Are you sure it's the reverse light or the overtemp light?

Are you sure you replaced reverse sensor switch and not the neutral switch? I have seen people do that.

Not sure if I replaced the reverse sensor? I did the neutral switch and the one next to it by the shifter linkage

I haven't seen a Grizzly 350 in several years now, but if I remember correctly there is 2 switches on top of the engine, near each other. One is for Neutral and one is for Reverse. Some models use the same switch for both lights...most use a different switch. I have no idea what your has. If yours has the same switch, swap them and see what happens.

My has the two switch's like you said. I replaced Booth of them. The reverse light will still blink.

Try grounding them and see if it stops