Take a good look at your terminal bolts next time you have them out. I had an issue with my red truck where the threads on the positive bolt were just barely stripped and I couldn't get it to tighten up properly. New bolt, tightened up like new. I was worried I might have stripped the terminal itself but luckily the Odyssey batteries I use have super tough side terminals. Good thing, I once stripped an ATV drain plug out with a 3/8" drive ratchet... I should probably use a torque wrench on everything I touch...