Driving along just fine and the car goes completely dead. No lights, nothing. Tried to jump and nothing - no dome light, no trunk light. Background: I have an Optima battery that my son ordered with the terminals on the wrong side. So, I bought a cheap lawn mower battery at Walmart to fit in the car, then have the Optima next to it in the trunk connected with jumper cables to the cheapo battery. Been like that for months with no problems. When I popped the trunk, the Optima battery had tilted over and was leaning on the cheapo battery. I'm thinking that the terminals made contact and blew out my main fuse. Does anyone know any other reason the car would die like that? Is there any other fuse that makes everything die? I've replaced a main fuse before, and they're a PITA. Also cost about $50 - for a fuse. *)&^$*%()(_& So, I don't want to do that again and have it not fix the problem. I've got to do it in the parking lot where I pushed it after it died.