Renault Repair Questions? Ask a Mechanic for Answers ASAP
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Check the charging current with the voltmeter. To do this, measure the voltage at both battery poles while the engine is running. The displayed value must be between 13.8 and about 14.6 volts.
If the measured value is lower the mechanic should check the alternator of the car. This does not provide sufficient charging voltage, so the battery discharges while driving. To protect the engine function, systems such as ABS/ ESP, seat heating, air conditioning, etc. are switched off in sequence. This is a typical behaviour when the battery runs down.
If the alternator is OK, the on-board system must be checked by your mechanic. In this case the alternator charges sufficiently, but the on-board electronics or battery charge management system does not recognise this and therefore thinks that the battery is discharging.