There's a way to jumper the seat sensor with an inexpensive resistor. Search MV for MP3 resistor. You'll find several threads on what to buy and how to install it. Shouldn't cost but a couple of dollars.
As for the underseat light, have you checked the bulb?
Or, did you mean the seat release switch? There are fuses in a couple of places on the body, including under a panel in the footrest area.
There's a second fuse block in the battery compartment. Try there.
The light in the storage area is off and the seat release is not working. It starts and runs great I checked the plunger switch at the front of the seat and it is not getting power. I think I just need to locate the fuse.
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