Solenoid Issue?

The solenoid does not mount on the body (of the car) so you need to clarify what you are speaking of. You talking about the starter relay?



In either case if the stud is loose, it sounds like you have removed the bottom nut. There should be a nut to hold the stud in tight, then the wire connections go on top of the bottom nut, then a second nut goes on top of the wire terminals