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Q: why my 2005 buick Terraza will not stay crank? on 2005 Buick Terraza

The horn will blow and the lights will come on but when I crank it up it cuts off.
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No the security light is not on ,however the car will not start on a boost either. All the lights are on it turns over but will not stay.
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The boost is mis-leading, it tells us the battery does not have enough amps to spin the starter. Is there any codes associated with the no start condition?
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Have the battery tested. Horn and lights require only a little power to operate, the starter draws much more and maybe the battery can't handle the load. You might try jump starting the car.
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