As in, the big terminal on the starter. But DONT short your wrench out against a ground.... Unhook the neg cable first. I had this problem on my Mopar when I was a teenager. Finally found out the old starter terminal had worn out inside from rubbing against the armature. It was flat on one side instead of round....battery cables....both ends. Have you tried jumping the starter and or relay?
If you don’t use it often enough. But, would like to on occasions. You have to have it hooked up to a battery maintainer. Or you’ll be buying more batteries than you would like. Classic car, motorcycle, boat, tractor. $20 is well worth avoiding the hassle.I'm picking a dead or dying battery since you probably don't use the car every day.
Could even be one bad cell ....which spells the death-rattle for a battery.