Car tries to turn over but won't start. Acts like dead battery, but battery tests out OK. Wife noticed problem when it last started, then clock changed, so she didn't turn it off until she got home. Now it won't start?
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If the car doesn't start with a jump you might have a bad alternator. The alternator supplies voltage to the car once the engine is running. If the battery is dead, and the alternator isn't putting out sufficient voltage, the engine cannot run. Then again sometimes a car with an extremely dead or internally shorted battery WON'T start with a jump. Replace the battery and try again.
Sounds like your battery has too many dead cells, or your alternator has gone.
After the car has been boosted, turn on the lights, heater, and stereo. If the car wants to die, press the accelerator slightly. If the car stays running, its your battery. If the lights flicker even with pressing the gas pedal, its most likely your alternator.
Check the battery to see if it is dead or weak. If you have a voltage meter check the voltage. If the battery is OK check the wiring to the starter to see if the connections are good and clean. It all that is good probably the starter or relay. Take the starter off and get it tested. If that is good focus on the relay.
Remove and clean the battery and cable contact surfaces. Make sure the battery has 12v...If not, have it charged and load tested. After getting power restored, have the charging system checked to make sure it's working properly (quick check is with all lights and accessories on at idle, you should have no lower than 12.9 volts at the battery, and volts should remain steady, not slowly dropping)