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driving a few days with new EA640 and charging voltage is about 13,6V
voltage in morning before starting engine is 12,60V.. like like used battery or faulty charging system, then i read this..
now it is easier to me to get the point :-D

 

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Thank you for the reply. (my english is not so good)
I live in a small city in Romania. Yesterday i finded a Renault Megane 2012 with 1.6 petrol engine.(here 90% are with diesel engine). I asked the car owner to check his car. I started the engine, then I measured the charging voltage with a digital multimeter, AND....it was 13,45V constant!!! So after this measure I think that we dont have problem with the charging system! On my car after starting the engine I measured 14,5V, after 10-15 seconds the charging voltage dropped down to 13,4-13-5V!
 

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It is power managment. Yes..
Diesels also have such stuff..
Alternator no more fills battery all time with highest voltage, but only necessary. It is because of ecology. Less stress for alternator, less gasoline consumption.
But in behalf of battery better lifespan, charge it manually with some charger once in 2 weeks, especially in winter.
I nave some smart charger from lidl, works good..


 
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