Battery drains - Page 2

macafee2 · 14th January 2020, 13:45

Although post one says no lights are on, is the boot light on? I ask as this may not be visible if a saloon.

macafee2

Mike Noc · 14th January 2020, 13:59

The boot light times out if left on Ian, same as the interior lights.

MarkS · 14th January 2020, 16:00

Quote:

Originally Posted by paul lambers

Today the battery was around 11.88V.
This morning I checked if there was a significant draw from the battery with everything closed down. So I put a multimeter between the negative cable and the battery and measured 2,2 A, which is not OK?. I checked the fuses in the engine box and didn´t detect any voltage drop, but I didn´t check the 150 A fuse. I hesitated to do that, but I suppose you can loosen that one by loosening the two bolts?
I put the battery on the loader now, it's practically dead, no use testing. I will do all this again tomorrow, check the measurements again/

1) When measuring the current between negative cable and the battery, you need to allow time for everything to settle down into standby before noting the current. And you need a constant connection. The moment you make the connection, everything in the car will wake up as it powers up.
You need to wait until the red LEDs in the wing mirror buttons turn off, then everything may have settled into standby.
2) If you are measuring the current between negative cable and the battery, presumably you have the bonnet up. Would I be right in thinking that that may prevent everything from going into standby ?
Anybody know ?

COLVERT · 14th January 2020, 18:45

20 minutes approx.---

MarkS · 14th January 2020, 19:48

Anybody know if having the bonnet up prevents the BCU (?) from going fully to sleep ?

And personally I think the 25.5V AC meter reading is the meter leading you up a blind alley. Otherwise there would be massive AC currents charging and discharging the battery. But I am open to other enlightened opinions.

/MarkS prostrates himself before the all-knowing God Brian of the Ancient Marina, may it's treads never wear down !

Mike Noc · 15th January 2020, 07:22

Quote:

Originally Posted by MarkS

Anybody know if having the bonnet up prevents the BCU (?) from going fully to sleep?

That's a good question Mark. When I checked for a current drain on our Facelift I didn't need to worry about the bonnet switch as the previous owner had removed it.

I'd guess that it doesn't, but I have yet to try it. It took around 20 minutes for the car to go fully to sleep.

pletevl · 15th January 2020, 08:50

When I did mine, I put a weight on the bonnet switch and then locked the car.

Pete

paul lambers · 19th January 2020, 13:59

Quote:

Originally Posted by COLVERT

Paul, how are you getting along with that problem.--have you found the short ??

I´m still looking what it can be, removing fuses to see which effect it has. I checked the battery, which is OK. I wonder if it can be related to the lots of rain we had here. The plenum is dry, no water standing there.
I checked the amperage again, but a brick on the bonnet switch, closed everything and I measured after waiting some time around 0.9 amp

pletevl · 19th January 2020, 14:38

900 miliamps is too high. It should be around 18 /20 miliamps.

But you probably knew that anyway :-)

Pete.

paul lambers · 19th January 2020, 15:25

Sorry, made a mistake: 0.09 amp, still a bit high maybe

14th January 2020, 19:48	#15
MarkS Gets stuck in Rover 75 Diesel Tourer, called Perseverance Join Date: Nov 2011 Location: Bournemouth Posts: 664 Thanks: 189 Thanked 157 Times in 108 Posts	Anybody know if having the bonnet up prevents the BCU (?) from going fully to sleep ? And personally I think the 25.5V AC meter reading is the meter leading you up a blind alley. Otherwise there would be massive AC currents charging and discharging the battery. But I am open to other enlightened opinions. /MarkS prostrates himself before the all-knowing God Brian of the Ancient Marina, may it's treads never wear down ! Last edited by MarkS; 14th January 2020 at 20:00..

14th January 2020, 13:45	#11
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,912 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	Although post one says no lights are on, is the boot light on? I ask as this may not be visible if a saloon. macafee2

14th January 2020, 13:59	#12
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,547 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	The boot light times out if left on Ian, same as the interior lights.

14th January 2020, 18:45	#14
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	20 minutes approx.---

15th January 2020, 08:50	#17
pletevl Posted a thing or two rover 75 cdti(rhd), MG ZR(lhd), MG TF(lhd), MG TF(rhd), mini mpi (lhd), Renault megane III (awful) Join Date: Mar 2014 Location: East of France Posts: 1,278 Thanks: 124 Thanked 114 Times in 93 Posts	When I did mine, I put a weight on the bonnet switch and then locked the car. Pete

19th January 2020, 14:38	#19
pletevl Posted a thing or two rover 75 cdti(rhd), MG ZR(lhd), MG TF(lhd), MG TF(rhd), mini mpi (lhd), Renault megane III (awful) Join Date: Mar 2014 Location: East of France Posts: 1,278 Thanks: 124 Thanked 114 Times in 93 Posts	900 miliamps is too high. It should be around 18 /20 miliamps. But you probably knew that anyway :-) Pete.

19th January 2020, 15:25	#20
paul lambers Regular poster rover 75 2.5 saloon Join Date: Nov 2007 Location: Gelderland Posts: 55 Thanks: 0 Thanked 1 Time in 1 Post	Sorry, made a mistake: 0.09 amp, still a bit high maybe