[94HeavyChevy]

So i know that i have current draw because i took my car to autozone for a free battery test and they hooked a machine to the battery while the car was off and it was jumpin all over the place. when i got home i pulled a few fuses to see if the battery charge was stronger but really could not tell. as i was putting the fuses back a few days later one of them sparked when i was putting it in. any ideas on why i would get spark while plugging a fuse in?