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dolly 20th-January-2006 14:53

Battery drain on my P38 Range Rover 4.6 HSE auto
 
Please can you help me, I have been suffering from a dead battery on my Range Rover 4.6 HSE 1998 Auto, if it not used for 2-3 days.
I have checked the following items:
  • Replace the battery and it still only lasts 2-3 days
  • Checked alternator out put with multimetre, and all is well (13.8 volts on tick over)
  • Checked the BeCM, and it is only pulling less than 0.05A, and does not seem to be wakening for any unknown reason
  • Disconnected the RF receiver to discount any interference at night.
  • Checked ear thing

Only one thing I can not explain is that there is a faint red light on the gear selector when in the parked position, which stays on when the car is locked up.
This Range rover has had a LPG conversion on it.


Any help please Dolly……..

mmaddock 20th-January-2006 15:38

Re: Battery drain on my P38 Range Rover 4.6 HSE auto
 
There is already another thread on this subject, check replies from there.

There are many sources of battery drain you are expriencing on the P38.

Check www.rangerovers.net which cover many of them, and also suggest fixes.

Matt.

dolly 21st-January-2006 00:12

Re: Battery drain on my P38 Range Rover 4.6 HSE auto
 
Thank for that, i have now found out that my volt meter was faulty,and the real current draw is 0.6 Amps.Have pulled all the fuses,but still it is drawing 0.6 Amps,with the alarm on or off.

Regards
Dolly

MUDDEE 21st-January-2006 00:41

Re: Battery drain on my P38 Range Rover 4.6 HSE auto
 
sounds like youve covered most causes. when parked do you leave the rangy in the park position otherwise this can cause battery drain. just a thought.

dolly 21st-January-2006 01:25

Re: Battery drain on my P38 Range Rover 4.6 HSE auto
 
Yes i do leave it in the park position, i will try it in a different position.

Thank you for your input.

Dolly

dolly 21st-January-2006 18:43

Re: Battery drain on my P38 Range Rover 4.6 HSE auto
 
BECM fault

--------------------------------------------------------------------------------

Still trouble with battery drain on RR 4.6 HSE have narrowed this down to the Becm not "going to sleep mode" after the normal 2 minutes.
Drain is 0.6amps and should be 0.06 Amps when in sleep mode.
Any sugesstions about repair, I believe it could be a blown Diode.
Could a competent Electrial engineer fix, and does anyone know of a repairer in the UK.
Any suggestions

MUDDEE 21st-January-2006 19:55

Re: Battery drain on my P38 Range Rover 4.6 HSE auto
 
some usefull info here.............
http://www.rangerovers.net/repairdet.../batdrain.html

ericlbt 8th-February-2006 11:57

Re: Battery drain on my P38 Range Rover 4.6 HSE auto
 
  • Disconnected the RF receiver to discount any interference at night.
Hi,
Could you please tell me where to find this RF receiver?:confused:
Do you have any pictures?
I would like to try the same thing on my Range.

Thank you.

eightinavee 8th-February-2006 20:52

Re: Battery drain on my P38 Range Rover 4.6 HSE auto
 
Have you disconnected the rf receiver since you have sorted your multimeter ? The current drain when the becm is asleep should be less than 30ma,usually 20-25ma.You can also determine if it is an underbonnet fault that is keeping it awake by removing the three large 60a maxifuses from the engine compartment fusebox.Beyond that the next stage to push it on further is to stick it on testbook and do a sleep test,it wont make it go to sleep but it will monitor all the relavent switch states to make sure everything is in place to let it sleep.

AVRO 10th-February-2006 17:20

Re: Battery drain on my P38 Range Rover 4.6 HSE auto
 
Check my thread about bad alternator... i had strange drain issues. This could be different issue, due to my BECM goes sleep and current drain goes less than 0.05A.

http://rangerovers.net/forum/viewtopic.php?t=5827


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