The BMS monitors the throughput of current to and from the battery, by connecting directly onto the battery negative terminal you would bypass the monitoring device and screw up the charging algorithms. By connecting directly to any other ground stud on the vehicle, you're ensuring that the charge and discharge current is seen by the BMS, that's all. Nothing bad will happen, just the vehicle systems won't operate necessarily as intended. Carrying out a battery discharge test through the BMS isn't a good idea though.
What did you do with your Range Rover today
- Thread starter Dopey
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Datatek
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Discovered a slow puncture in the RH front of one P38.
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I've got one of those in a four month version
Datatek
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This one only goes down with the wheel in one position. When it warms up I'll take the wheel to the local garage to get it fixed.I've got one of those in a four month version
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Are you saying that the BMS is in series on the earth terminal from the battery?
Electrically no, most use some sort of shunt to measure the current and are generally very accurate - accurate enough to measure quiescent current down to single mA and high enough to measure starter current in the 100's of Amps. Some of the early ones were true 'series' devices and were often damaged if the vehicle was incorrectly jump-started. The BMS usually communicates on a LIN to whichever module has the supervisor function for charging, autostop, etc.
If anyone is interested / suffering from insomnia, attached is the Description & Operation document for L405 battery management
If anyone is interested / suffering from insomnia, attached is the Description & Operation document for L405 battery management
Datatek
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It probably uses a Hall effect device rather than a shunt.
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Things have moved on a bit since my college days of the early 80's
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Only thing I know about rabbit holes was we used to send the ferret down it to get our supper out 
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Alice was rather partial to a rabbit holeOnly thing I know about rabbit holes was we used to send the ferret down it to get our supper out
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Corrected that for you
stuu
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Good
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Bad earth? Or a diode in the alternator cooked?
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Don't know but it has a second battery.. motorcycle sized agm which is ancient... Bet that's causing problems
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They can cause issues yes. If it is a Duff battery then it is an apparent problem
stuu
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Well back too using the RR, got the father in laws mini to sort so iv left mine at his,
Facebook memories came up thought id share,
Facebook memories came up thought id share,
Who the feck is Alice?
Blob
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Replaced the desiccant in the air suspension drier - wasted time and money on that then, still have the same fault. Grr!
The strange thing is that it always lowers when using GapIID but almost never lowers the front of the car when selecting access mode (or when it needs to do it itself)
The strange thing is that it always lowers when using GapIID but almost never lowers the front of the car when selecting access mode (or when it needs to do it itself)
