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2011 Chevrolet Camaro - Intermittent No Crank

2011 Chey Camaro will not start sometimes. try to crank it …nothing, no sound, dashboard black…try again it cranks…
Autozone say starter alternator is good… bought another battery… same thing

Could be the ignition switch itself but I’d guess the crank and start relay is wearing out. The ignition switch doesn’t actually start the car anymore, it just tells the computer to do it. There is a relay underhood in the fuse box that cranks the starter. It can be intermittent. Replace it, they are cheap and it may very well fix the problem.