Voltage drop

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nas

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My car is a merc 190 2.3 16v cosworth the problem i have is the voltage battery gauge is reading 10-11 volts all the time , what i want to know is is this normal for this type of car or do i have to get over 12v ,because i have a audi coupe and it allways reads 13-15volts, also sumtimes my car tends to idle up and down.
 
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jaques2k

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Can only speak for what is "usual", not specific for your car, but usually when the alternator is running the voltage should exceed 12V up to about 13-14 volts. Do you have the readouts from an ordinary voltage meter or is it a voltmeter installed in the car? If it´s not rising during revving the engine, something is wrong.
 
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cen

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Voltage should be reading 13.2 volts. Suggest a cell may be down in your battery
 
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talbir

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With the car at idle speed, your voltage should be at least 14.4volts.


And at least 13V with engine switched off.
 
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