if your radio is not stock then the wiring is not correct or depending on the year you may need a specific wiring harness for the car which can be bought and installed by any extreme audio store. that would be the case if your car radio stays on when the car gets turned off.
It uses energy
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Turn the ignition key to the accessory position which is normally counterclockwise. Only the radio will be drawing power. If you have a good battery you could listen for a couple of hours without running the battery down. Any longer and the battery may go dead. Make sure that the headlights are off; these may still remain on when the key is in the accessory position. Headlights will drain the battery very quickly. It may also be advisable to run the engine for a few minutes every half-hour or so, to recharge the battery.
810 joules / 30 minutes = 810 joules / 1,800 seconds = 0.45 joule per second = 0.45 watt.By the way:-- The battery supplies the energy at the rate of 0.45 watt.-- The radio uses or consumes the energy at the rate of 0.45 watt.
Sometimes there can be enough power in the battery to run electrical things but not enough to start the engine. You need to get the battery tested to see if it will hold a charge.You can try to jump start it using another battery. If it will not start this way,try charging the battery first before going on to the starter. If it turns out to be the starter, you can have it rebuilt. This can run about 20.00-40.00.
You have undoubtedly changed batteries or run the battery down. The display LOC means the radio is locked. You will have the insert the proper code to active the radio. If you cannot find the code, contact your GM dealer. Head on over to www.DelcoLockCodes.com. They charge $4.99 for the code but they got back to me in an hour or so and the code worked perfectly. Better than paying a dealer $40 - $50!
Yes, the battery will be ruined.