Recently replaced brake booster and in the process of getting the last bolt out I heard a clicking under the dash. The clicking sound just started. I thought the battery went dead so I unhooked the battery. Got everything put back together. Tried to start the truck and wouldnt start. Wouldnt go into gear. Was told it could be the brake switch and so I replaced it. That didnt work. What could it be?

 

 

Welcome to the Blazer Forum... Have you checked the neutral safety switch cable? Just a thought from me though