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Checking the voltage with it off is only for the battery not alternator....also low volts dont mean it wont start the car its about the amps needed to. I use odb reader while car is running and test under load especially like accelerating on ramps etc wiht lights, ac, radio, etc all on to make sure alternator can handle it.
my sisters c230 sport had 11.6 volts which is not to low should start the car but wouldnt even try lights worked etc had to jump to charge it above 12 and let it sit for a like 20 mins and was able to start it to bring it home.
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11-28-2018, 08:42 PM
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