Mercedes-Benz W164 battery charging and discharging
ML 320 CDI
Mercedes-Benz W164 charge light is on and the battery isn't charging, what is wrong?
Measure the charging voltage: it should be clearly above 14.0 V. The cause can be a poor connection between the alternator and the battery. Charging may also only start once the revs rise high enough.
Mercedes-Benz W164 cuts out while driving or won't start, only clicks. What to check first?
Check the battery terminals and posts. A loose negative terminal can switch off the engine and make the instrument cluster lights flicker. A mere click can be caused by a poor terminal, an oxidised post or the connection of the thick ground cable.
Why does the Mercedes-Benz W164 battery go flat while the car is standing?
The cause can be a device drawing current, for example the CAN bus (the car's internal data bus) staying awake. Check whether the display switches off after the doors are locked. For longer standing periods, connect the car to a maintenance charger.
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