Good afternoon, I replaced my stock head unit and all speakers. Added an amplifier, will be building a custom subwoofer box later. After I installed everything and the car wouldn't start. All light in the dash turned on and no crank.

 

Did you disconnect the battery while wiring? If not, could have blown a fuse somewhere - hopefully you didn't cross any wires.

Also there's a chance the battery died via too much testing/tuning.

 

Thanks for the info. I forgot to detatch the battery before I started. Ill check the fuses and battery after work. It was too late last night to check anything. I reinstalled the old head unit and it still didn't start.

 

"Check fuse" means measuring them. I'd be trillionaire if I had penny for every time I heard, "Fuse looks OK!" but didn't actually conduct any electricity. And don't just replace fuses with new ones thinking that'll ensure they're good. Auto parts are so bad, many of them are bad right out of box and those too needs to be measured to verify they're good before using.

Also measure fusible-links as well.