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When you start your car the battery starts it. When the car is running the alternator makes the voltage to run your car and it recharges your battery. If alternator is not putting out enough voltage then your battery has to run your car and it will get to a point the car shuts down due to lack of voltage. The cars computer now day will starting shutting down thing which use voltage if the car does not need it to run when the voltage get to low. My 2006 cobalt, I lost the radio, A/C and even the power steering electric assist motor when voltage got low. Charge your battery, crank your car turn on headlights and check voltage at the battery it should be over 14 volts even up to over 15 on some cars. If not you may have alternator problem or wiring problems.
links with additional info below https://www.youtube.com/watch?v=30ab7ueJ2H8 https://www.youtube.com/watch?v=AzjcZuk7sNg https://www.youtube.com/watch?v=pwiO4nvSbeY
I have a 2003 GMC Sierra Z71 Extended Cab and the headlight switch won't turn off the headlights while the truck is running. When I got the truck the Photocell Sensor which is the black bubble that sits on the dash that tells the daytime running lights to turn off and on was down in the dash so I fished it out with my fingers and clipped it back in and it made the daytime running lights work. I still can't turn my headlights off while my truck is running though. The owner's manual says that I am able to do so. There's 2 light's on the switch by AUTO and the O for off that should light up? Is it my whole switch?
The first thing to do is have the battery tested, just because you charged it doesn't mean it will stay charged if the cells are sulfated up or shorted.
Disconect the battery and ECM for FOUR DAYS then reconect the ECM and BATTERY. Let it sit for another four days without turning anything on. It should start but will run rough for about 200 miles as the ECM relearns the system. I had the same issue and that is what fixed it.
Do a voltage draw test with a DVOM to determine if anything is staying on, also charge the battery and have a free test run at Kragen or other chain parts store. Common sources of voltage draw issues running down battery are glove box lights, truck lights to name a few.
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