Member Since: 05 May 2013
Location: Hertfordshire
Posts: 676
What voltage.
What voltage should I get at battery with engine running?
I'm getting 13.8 volts, and once the system is loaded (lights on, heated screens, heated seats) it drops to 12.9 volts.
Is this correct?
Thanks Andy.
29th Jun 2016 12:30 pm
tayaste
Member Since: 15 May 2013
Location: Chester
Posts: 7633
Nope, sounds like your alternator is goosed.
29th Jun 2016 12:41 pm
Discogaz
Member Since: 17 Mar 2014
Location: Bracknell
Posts: 1399
Mine only ever crept up to 14+ volts in the dead of winter when temps around freezing and nowadays
bounces between 13.7 and 13.8 regardless of what's running.
Put a new alternator from AF on last year and a new battery a few weeks ago and no change.
29th Jun 2016 12:41 pm
AN
Member Since: 26 Jul 2005
Location: Hungary
Posts: 327
I have seen once 14.9V, usually goes up in the morning to 14.7V, and goes down to 13.6V on the return trip. I never seen anything under 13.4V.
I have a Volt meter permanently in the cigi lighter.LR D3 S Black, Auto TDV6
29th Jun 2016 1:42 pm
geoff.
Member Since: 24 Jan 2010
Location: West kent
Posts: 8531
You need to take a few factors into consideration
Battery,alternator and temperatures I've seen 13.7/8 in warm weather and as high as 15.4/5 in cold
What problems are you having ?
29th Jun 2016 2:10 pm
Discogaz
Member Since: 17 Mar 2014
Location: Bracknell
Posts: 1399
Could be battery on way out or alternator as 12.9 indicates to me that it's not getting/holding a sufficient charge.
Andy, respond to Geoff and he will advise, he is a guru.
29th Jun 2016 4:01 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10602
Re: What voltage.
Landy_andy wrote:
What voltage should I get at battery with engine running?
I'm getting 13.8 volts, and once the system is loaded (lights on, heated screens, heated seats) it drops to 12.9 volts.
Is this correct?
Thanks Andy.
Why do you ask ?
It doesn't sound too bad to me if your switching everything on, and at low idle.
29th Jun 2016 6:52 pm
tayaste
Member Since: 15 May 2013
Location: Chester
Posts: 7633
Voltage shouldn't drop to 12.9v with heated screen etc on. Alternator voltage should increase to cope with it.
Do you get low power mode displayed on the radio when turned above 20 with everything turned on ?
Not always, depends on the charge state of the battery, if you have a failed alternator, you get about 20 miles before the car dies due to lack of electricity, been there done that
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29th Jun 2016 10:33 pm
~Rich~
Member Since: 16 Mar 2009
Location: Sydney
Posts: 627
I had a brand new genuine L/R alternator fitted last Friday.
I now have a issue when the car is starting from cold, it starts then:
Radio cuts in and out.
Dashboard displays pulsate at the same time engine revs up and down by itself.
Handbrake light comes on ( handbrake is off) flashing orange!
This occurs for only a short time before things return to normal.
Here is a video showing the voltage variation:
Now driving to work in the morning when it is about 3 - 7 degrees the alternator is putting out approx 15.5v but I also saw some spike of 17.5v and once 18v!
Car is going in tomorrow to get another genuine alternator fitted 2005 TDV6 HSE Silver, LLAMS Height Controller, Tinted Glass, Onroad - 19" GG AT's, Offroad - 18" 275/65 MT, Traxside Dual Battery kit, Rasta Protection Plate, Alpine Roof, BAS Remap, ARB Air Compressor, eDiff Custom Drawer and storage unit -http://www.box.com/s/jem0ilac3cner2mexq64 UHF CB, 4x4 Intellegence RWC, 120ltr Long range tank, Rock Sliders and Compressor protection plate Beanie grill, De Tango.
29th Jun 2016 11:14 pm
Landy_andy
Member Since: 05 May 2013
Location: Hertfordshire
Posts: 676
It's used every day and no issues. Then fitted a second battery and split charge VSR, with monitor, also fitted a new exide battery. The monitor, and other meters are showing that I'm getting 13.6v at tick over and whilst driving, so the problem that I have is that the VSR that I've installed is cutting in, then out constantly. The same system has been installed on my last Defender where all was ok. My concern is that I've got a brand new starter battery, and brand new alternator, and a unused leisure battery that is not going to be charged as the voltage is not high enough (above 13.8v) to keep the split charge relay switched on. It just keeps clicking in out, in out.
Andy
29th Jun 2016 11:21 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
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Member Since: 15 Jan 2016
Location: GL
Posts: 10602
tayaste wrote:
Voltage shouldn't drop to 12.9v with heated screen etc on. Alternator voltage should increase to cope with it.
No the voltage should not increase. The ideal is that the voltage remains constant.
But this depends on the alternator rating being sufficient and idle speed high enough.
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