I have an old school 1978 Ford Econoline 150. I'm pretty sure the engine is the 351 V8. The battery died the other day, and I bought a new one. Not the same size as the old one (smaller than the old one), but had better cold cranking amps, so I picked it up. I had to replace the positive (red) battery terminal, as the bolt was corroded. I put the negative terminal on first, and then touched the positive terminal, and big sparks were coming from the terminal. I tried switching the sequence, and a small fire ran down the length of the negative terminal, and now the van won't crank. I don't know if it was the battery, or what the deal is/was. Any suggestions? Nothing is turned on, such as lights, or other accessories, as this van only has two captains chairs, and an empty cargo bay. Thanks for your suggestions.