I put in a new audio system and now the truck won't stay running.

I installed a new audio system in my 2003 GMC Sierra and now it will crank and start, but shuts off as soon as I release the key. I used the yellow ignition wire from the ignition switch to power the system. I have the same issue after I removed the power from the audio system.

Update (08/16/2022)

I think I got it fixed. Apparently, you sometimes have to wait 5 minutes to try restarting after battery disconnection.

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