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Discussion Starter #1
Since last year my 2010 Acadia getting problems at start in cold weather, many times I have to use booster (boost from battery not from under hood) to start the car, checked power was only below 12V. And once the car started it will be okay for whole-day of that day, but next day? don't know....
The passed spring, summer and falls was fine, but yesterday and today the problem come bake again...馃槹

Anybody had same issue here? Thank you for any reply
 

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Battery could be getting weak even though there is enough voltage available. Have the battery checked to see if it has enough cold cranking power (amperage) to start the car.
 

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No any one ever had this problem here? checked the voltage of the battery was 11+V only at engine off, and 14.50 to 15+ V at engine running. Would it be alternator or voltage regulator (don't know where this part locate) issue?
 

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... Would it be alternator or voltage regulator (don't know where this part locate) issue?
Doesn't seem that way based on your observation. Testing with a volt meter alone is not a definitive way to pinpoint a cold start (crank) problem. Leave the vehicle over night with someone who has the proper test equipment and can evaluate everything (starter/battery/alternator) when the vehicle is cold.
 

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Are you checking the battery voltage at the battery terminals? If you are reading only 11 volts with engine off, you may have a higher than normal parasitic load.
With the engine and accessories off, (never disconnect battery terminal with engine running), disconnect the terminal and then check voltage again, see if it goes up to 12-12.5 volts. If it stays at 11, maybe a bad battery.
You can check the voltage with engine off , all lighting and accessories off, and remove fuses, one at a time, and then replace before removing the next. If one particular removed fuse causes the voltage to jump up, then you probably found your problem circuit. You should go through all of them to see if you have more than one. There are fuses under the hood and behind glove box.
 

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If at 11V . . the battery is not fully charged. Even a "new" battery these days can go bad or have been made with a defect.
I'd pull the battery and put it on a good charger for and hour or so then do a load test. If it reads under 12 volts after a short 5 or 10 seconds load test, the battery is likely weak.
 
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