Vehicle & Technical > Range Rover

Battery going flat overnight on RR p38 any ideas!!!

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Brett69:
I just use a 12v 10w bulb you shouldn't need much bigger than that. I've just brought myself a P38 DSE Got back from a 450mile trip to collect it. needs work but really pleased with it for the price I paid  :grin:

Rossko:
Mystery battery drain on P38 is usually due to the alarm system being put in "high alert" by some local radio interference, without setting it off.
Typical causes ; airport ground radar, wireless networks, ... see
http://forum.landrovernet.com/showthread.php?t=99536

waveydavey:

--- Quote from: Rossko on October 11, 2009, 23:02:07 ---Mystery battery drain on P38 is usually due to the alarm system being put in "high alert" by some local radio interference, without setting it off.
Typical causes ; airport ground radar, wireless networks, ... see
http://forum.landrovernet.com/showthread.php?t=99536

--- End quote ---

What he said: they are well known for it. Basically the BeCM goes to sleep and has minimal power drain, if it gets a signal forma  key it wakes up to interrogate it and that uses a lot more power as the whole BeCM is awake.
The problem is that the BeCM sees all sorts of things as keys and can wake up too often.

charlie420:
check the alternator charge mine would be fine for days when used but then af left for a few days battery would be flat alt was only charging at 11 volts i turned the idle speed up a bit now reads 13ish all the time and no more battery issues even when left for a few weeks

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