BMW X3 E83 battery goes flat: parasitic drain and charging
X3 3.0X3 3.0si
How do you find out why the BMW X3 E83 battery goes flat overnight?
Connect an ammeter to the negative cable and measure the current once the car has gone to sleep. If the car does not sleep, remove the fuses one at a time while watching the meter. When the current drops, you have found the circuit at fault.
Why does the navigation drain the BMW X3 E83 battery?
The parasitic drain was 0.5 A, and it fell to about 17 mA when the DVD drive's wires were disconnected. The oxidation on the drive's connections was cleaned and the fault went away.
The BMW X3 E83 charging voltage is 13.2 V and the battery does not charge, what is wrong?
The voltage can drop by about 0.3 V under load when the revs are raised. Check the engine ground cable by grounding the engine to the car body and measuring the voltage again.
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