\"POP\" What was that? A friend's wife's Blazer (late 90's S-10) started acting all weird yesterday, so I went after work to go tow it home for them. It still ran, but it kept having weird power surges and all the guages acted weird. He went to start it to drive it onto my trailer, and it acted like the battery was dead. I wiggled the positive terminal connection on the battery, he want to start it and "POP". Sounded like a firecracker, right next to my hand at the terminal connection. No spark or anything. But I did feel like the force from it hit my hand... whatever it was. What could cause something like that? Like a total noise only explosion.