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-   -   What is the core function of the battery light on cluster (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/101883-what-core-function-battery-light-cluster.html)

blackbeast 10-01-2015 11:21 PM

Quote:

Originally Posted by jsoto (Post 1053267)
All I can is ahhhhh......new alt did the trick.

Glad it worked out for ya. It's a good feeling

jdstrickland 10-02-2015 02:20 PM

The battery light is not a battery light at all, it's a Charging System Light. The light means, ALWAYS, that there is an issue with the charging system, and the issue will be the alternator nearly 100% of the time. The times it isn't the alternator, then it is in the connection of the alternator to the rest of the car. There is no light to tell you that the battery itself is unhappy with its life, or the job that is is assigned to carry out.

jsoto 10-02-2015 03:02 PM

JD -

In my case, my alt was putting out correct V. It was not putting out enough current.
The light never ever flickered or lit up

jdstrickland 10-02-2015 03:41 PM

If the voltage is right, 14.5 when the engine is running, but the power is low, then the voltage must fall to a level that is below the specification.

If the engine is running and there is no load, then the voltage will be, or should be, 14.4vDC or there about. If the system has a heavy draw, AC is on, radio, lights, and other electrical loads, but the current is weak, then by definition the voltage must fall. It is a requirement of Ohms Law that when the power -- voltage -- is fixed but the current is low, the voltage has to be low. It has to be.

When you are facing this sort of problem, turn on all of the electrical loads you can find, then see what the voltage supplied by the alternator is. If the current is below specification, then the voltage has to suffer under heavy loads.

If you are driving around in daytime, and the battery survives the ordeal, but leaves you stranded at night, then you have low current provided by the alternator. This condition might not be indicated by the Charging System Light. You should have low voltage at this time as well. If current is low but the load is high, the voltage will drop while the system struggles to provide the power that is demanded.

jsoto 10-05-2015 07:34 PM

Woot Woot.
2 Days of Driving and I'm pretty positive the hiccups are done.
I can now unload my car and make the X back the soccer toddlers car back again.

Ahh....I've got my 2 years worth of wrenching. Hopefully no more until Summer 2016
\\\Did I just jinx it


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