well yesterday I bought a 83 pickup and it was running good when we loaded it on the trailer but the battery was dead and when we got back to drop it off I put the battery from my willys in it except that I was really tired and it was dark and I hooked it up backwards and now it wont spark. I checked the fuse panel and there where 3 blown fused and I replaced them this morning. but I still wont spark. what should I check? are there any other fuses I might be missing? Any suggestions would be appreciated.