My buddy has a 91 std and it stopped starting, i traced it down to behind the fuse box there is another little black box that has a blk and wht wire going in and blk and wht coming back out if i bypass that box altogether the car will start and run fine but if not it wnt start, my question is what is the little box. thanks

 

are those the only wires coming out of it? could be the main relay.

 

as far as he can see yeah those are the only wires he followed the wires coming off of the ign switch and he said there is one blk and wht wire going in and coming back out i thought it might have to do with the clutch switch but wheni looked at my car it doesnt have one i dont have to engage the clutch in order to start mine but his you do.