I have same issue after replacing battery..my instrument cluster lights up like a Xmas tree. Lol.. then it spazzes. Wich lead me to think a fuse or cluster…comming here makes me thnk it's cluster.i will check neg terminal anyway..but it's got to be cluster…it's bump dependant..if I slap dash, something different happens…I'm no electrician, so no soldering for me…. Weather the car starts or not is dependant on slaps..or resting time