Car cranks will not start

What did you do to get it started and was it idling and then just cut off?

Was there a part that you replaced that got it started?

We need to do two things. First, use starter fluid in the intake and see if fires. Then pull a plug and reconnect it to the plug wire and hold it against the block when craning to see if you have spark.

https://www.2carpros.com/articles/car-cranks-but-wont-start

You are welcome. So did you have spark and I assume it did not start on starter fluid? If you have spark and fuel then we need to verify compression.

Was anything done to this vehicle or did it just stop running one day?

https://www.2carpros.com/articles/how-to-test-engine-compression

So all this started after they tried to install the radio? We need to find out what wiring they tapped into because until we can eliminate what they did then we will be chasing our tails.

It could be the alternator not charging the battery but it could also be something not "going to sleep." Basically there is a system that is constantly on and it drains the battery. If this person tapped into the wrong thing or didn't wire something properly then it could be the issue. Think of it like your cell phone screen never turns off when you are not using the phone. The battery would last maybe a few hours. Instead it turns off and "goes to sleep" and it allows the battery to last days.

I attached the alternator test and how to rebuild it but it may be easier to have a parts store check the battery and alternator output. Most do this for free. If they are okay then we need to test for an ignition off draw or a parasitic draw.

If you have no signal coming from the CKP sensor then the ECM is not getting the engine position and will not know when to fire the plugs.

You need to test the sensor and I suspect you will find that this is an open and needs replacement.