Audi A4-how do i know if my alternator is bad or
START engine and turn on head lights to main beam if engine stops and battery is flat then the Alternator isent putting out 13.5 volts or 12volts so then turn off lights and turn on inn and with a test light check power lead on Alternator if you have power to alt then you have either Reg or brush problem .
Take it off and get it tested and if slightly faulty then get a change over one and refit start and recheck your head lights as they should come bright when engine runs evan at idle .
ITS that easy
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