Member Since: 14 Oct 2013
Location: 'Sunny' Zomerset
Posts: 9424
Quick couple of questions....Low power mode and FBH
Hi all,
Had a little problem this morning, got into car after being in town for a few hours, noticed that I had no sound on radio, CD and no Sat Nav display, car also labored when I started her. Also noticed "Low power mode" message displayed. NO battery light on dash!
Got home and disconnected battery for 10 mins, and everything came back to normal....I also checked the battery:
- Battery disconnected = 12.72 volts
- Batter connected = 12.51 volts
- Engine running = 13.87 volts......checked again after 2 mins running = 13.85 volts.
No burning smell or anything......what are your thoughts, just one of those things?
Even though voltmeter says battery is OK, I've left it on trickle charge and will do so overnight........oh yes, last week or so I've only really been doing short journey's........so may help explain my issue
2nd question, when bonnet was open and I was fiddling, I touched the FBH exhaust and is was very hot....temp was about 11 degrees outside, so why would the FBH be on? I thought it only came on at 5 degrees or lower?
Cheers guysIggy/Ieuan
Current LR =
2015 RR Sport Autobiography
&
1992 Land Rover Defender Camper
- Gone but not forgotten:
MY10 D4 GS
MY05 Disco 3 'S'
MY14 FL2 HSE manual in Blue
MY15 Disco 4 HSE Lux in Santorini Black
MY08 Disco 3 SE manual in Buck Blue
1960 Series 2 88" (No idea why I sold it!)
4th Jan 2014 4:02 pm
Iguana
Member Since: 14 Oct 2013
Location: 'Sunny' Zomerset
Posts: 9424
Any thoughts?Iggy/Ieuan
Current LR =
2015 RR Sport Autobiography
&
1992 Land Rover Defender Camper
- Gone but not forgotten:
MY10 D4 GS
MY05 Disco 3 'S'
MY14 FL2 HSE manual in Blue
MY15 Disco 4 HSE Lux in Santorini Black
MY08 Disco 3 SE manual in Buck Blue
1960 Series 2 88" (No idea why I sold it!)
5th Jan 2014 10:16 am
Dave^
Member Since: 23 Jun 2013
Location: West Yorks
Posts: 706
I'm pretty sure the fbh is always hot due to heat transfer from the engine coolant...
Have the “low power“ issues gone? I had low power mode when listening to music via the aux input, and having to have the hu volume quite high to compensate for the low volume of the iPud... Doesn't do it when listening at “normal“ volumes...flickr
5th Jan 2014 10:32 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Check the voltage in the morning before you start the car. This will ensure no surface charge and show what state your battery is in before being used for starting. Currently your figures look ok unless the results are false due to surface charge.
The battery light is actually a warning caption for the alternator. Given the failure modes of the alternator it is not even a good indicator for that.
The FBH exhaust has low heat capacity and I would be surprised if it was hot due to coolant alone.
So that just leaves the alternator output - this looks to be too low, especially in the cooler weather.Land Rover - Turning Drivers into Mechanics Since 1948
Robbie, please explain the meaning and effects of "surface charge".
ThanksVolvo XC60 - does all that the D4 should have done
Discovery HSE MY16 (good apart from the heating), now sold
Audi TT Roadster (wow)
MGB Roadster (owned since 1992)
Discovery 3 TDV6 HSE MY08
Saab 9-5 Aero 2002 (gone but not forgotten)
5th Jan 2014 11:10 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
When car batteries are being charged they cannot complete the chemical reaction quick enough. As a result most of the charging activity occurs on the surface of the plates leaving them with a slightly elevated voltage that is not representative of the true state-of-charge (SoC). To remove the phenomena you can partly discharge the battery by switching on a load for a few minutes or allow the battery to rest for a few hours.
Using a voltmeter to test batteries is a bit crude (it is not what I use when testing batteries) but with a few precautions it is ok.Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 14 Oct 2013
Location: 'Sunny' Zomerset
Posts: 9424
Thanks Robbie, had it on charge all night and fine this morning, will check voltage again 1st thing tomorrow and see what it reads....going in to Indy on Tue for prop shaft, will ask them to look at fault codes and alternator Iggy/Ieuan
Current LR =
2015 RR Sport Autobiography
&
1992 Land Rover Defender Camper
- Gone but not forgotten:
MY10 D4 GS
MY05 Disco 3 'S'
MY14 FL2 HSE manual in Blue
MY15 Disco 4 HSE Lux in Santorini Black
MY08 Disco 3 SE manual in Buck Blue
1960 Series 2 88" (No idea why I sold it!)
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