Update:::Unidentified Electrical part on Allegro Bus

Don't go guessing as to what it is based on comments here. Make sure you KNOW what it is before installing something in its place. Even if it is an auto reset circuit breaker, do not replace it with one of the cheap ones from the auto parts store. Most, if not all, of those are not water tight. Mounted on the frame near the transmission it would need to be water tight. That one in the picture appears that it probably would be.