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[gdanaher]

Sheesh! Everyone here needs to take Physics 101.

Two things to learn here. First, the battery stores electricity, sort of like a big capacitor. It is designed to release energy very quickly to spin the starter motor which starts the engine and activates the alternator. The alternator then provides all the electrical needs of the car as well as recharging the battery. If you have electrical devices connected which meet or exceed the capacity of the alternator then the battery is going to drain off as well and the next time you try to start it the battery will be depleted so it isn't going to start.

Now to the radio. I rather doubt it has anything at all to do with the other loads on the system assuming the engine is running and the alternator is operating properly. More likely is the possibility that in the process of wiring stuff up you failed to connect something 'very well' or you have a slightly loose connection somewhere or a loose ground. Also it is possible that the alternator or regulator is going south and the voltage is low. Using a volt meter I would monitor the voltage at the battery and then check the voltage at the radio and see if you have a substantial drop, say more than .5 volt. If immediately after starting the voltage at the radio is well below spec then it might not come on, and if it takes a while for the voltage to come back up then you have other issues. The radio might just be a symptom.

Finally, it might be an issue with the ignition system. Are there other accessories operating in that position that function properly when the radio is not? If everything is off then it might point to a more centralized problem.