Put a new catalytic convertor on the car, a 91 V6 Firebird. Then car won't start, not getting any spark. Read everything out found out the pickup coil is bad, changed it out. The car cranked over twice and then nothing. I mean nothing. I get no lights, no radio no power what so ever, can't even get the trunk to close. It's like the battery isn't hooked up. I read out the battery 12.6 volts. I tried to jump it, still nothing. I have no clue. PLEASE help !!!

 

Check your grounds...There should be one to the frame and one to the block. Make sure they're clean and tight. I'm no expert, but that's where I would start...Good luck!

 

Thanks, already checked the grounds. I'm going to check the fusible link by the starter and see where that leads.