The two left SPST switches are the fuse lugs of the circiut that shorts out intermittently. Connect indicator at fuse box. Vertical SPST at right is correct value fuse for circuit.
When Vertical SPST opens (fuse opens)
the 5 watt lamp lights showing fuse just now failed. The wire length allows us to mount this light indicator where it is easily seen to help determine when and what may be shorting out this circuit.
