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doclees



Member Since: 25 Jun 2015
Location: PA
Posts: 393

United States 2004 Range Rover HSE 4.4 V8 Java Black
Normal Battery Voltage needs for this beast

I understand these vehicles electrical systems are sensitive to battery voltages. Just noticed my iidtool shows my battery at 11.8 to 11.7 and in red when key on. But engine off. Charges fine and no problems starting. Battery getting too old for this car?

Post #435006 15th Apr 2017 10:42pm
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Joe90



Member Since: 29 Apr 2010
Location: Winchester
Posts: 4605

England 2002 Range Rover HSE Td6 Alveston Red

What is the charge like from the alternator?

Test with engine running across battery terminals... 


Have "IID non BT 02-05" & "RSW All Comms" in Hampshire - happy to help Smile
Also have VAG VCDS if you have an Audi/VW etc.
Always have comprehensive toolkit: hammer, duct tape, WD40 Wink
robertus-maximus - sollus-arbilla vagor stlata

Post #435009 15th Apr 2017 11:51pm
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doclees



Member Since: 25 Jun 2015
Location: PA
Posts: 393

United States 2004 Range Rover HSE 4.4 V8 Java Black

I will test across terminals when I get back home. Iidtool gives me a 13.8 to 14 v when engine running. Turn engine off and iidtool reads 12.2 and trickles down to 11.8 in about 3 min. When it drops below 12v the color goes from green to red.

Post #435011 16th Apr 2017 12:55am
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Mulcher



Member Since: 08 Aug 2016
Location: Shropshire
Posts: 127

England 2006 Range Rover Supercharged 4.2 SC V8 Zambezi Silver

Your charging voltage seems OK-ish. I'd be expecting 14.2 or a touch more just after starting. Static voltage of anything less than 12.6 V is less than ideal on a Fatty and can lead to starting difficulties and/or error messages.

If your static voltage is dropping to 11.8 three minutes after stopping engine then you have a current drain somewhere or your battery is knackered and isn't holding a charge.

Do bear in mind, though, that the IID tool itself consumes power so it is better to use a multimeter across the battery terminals to get an accurate reading. 2006MY 4.2 SC
Triumph Tiger 1050
1979 Pontiac Trans Am

Post #435101 16th Apr 2017 7:23pm
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doclees



Member Since: 25 Jun 2015
Location: PA
Posts: 393

United States 2004 Range Rover HSE 4.4 V8 Java Black

Thanks. Yes I was wandering how much the iidtool could be using. I will test across terminals tonight after everything stops whirring and buzzing.

Post #435104 16th Apr 2017 7:40pm
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speedymarktd6



Member Since: 20 Nov 2008
Location: Worcestershire
Posts: 685

United Kingdom 2007 Range Rover Vogue TDV8 Stornoway Grey

How old is your battery ?

Buy a new battery , put it on charge first till fully charged just to be sure then fit to Range Rover and see what readings you get i will never surrender to bling , mud and dirt all the way oh yeah . and pheasent blood in the back.

Post #435197 17th Apr 2017 2:19pm
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RR2008HSE



Member Since: 06 Jan 2013
Location: British Columbia
Posts: 2855

Canada 2008 Range Rover HSE 4.4 V8 Java Black

There is a huge load on the battery when you start. An old, weak battery might be able to show 12 V on a meter, but not sustain it under a big load. There are fancy machine for testing batteries under load, but such a rapid loss of voltage would tend to indicate further investigation is warranted.

Post #435232 17th Apr 2017 8:10pm
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doclees



Member Since: 25 Jun 2015
Location: PA
Posts: 393

United States 2004 Range Rover HSE 4.4 V8 Java Black

Can't read the battery year. I'm guessing about 3 yrs old. PO would have put in new battery when purchased in parts. Resting volts across terminals is 12.33v. Only thing drawing power is the LED on the USB charging outlet.

Post #435259 18th Apr 2017 4:26am
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mikeyyn



Member Since: 17 Oct 2011
Location: Notts
Posts: 49

United Kingdom 2011 Range Rover Vogue 4.4 V8 Buckingham Blue

I have been playing with my IID today and have almost the same readings. After a few mins with the ignition on to allow reading of VIN and to allow unlocking of the new tool the voltage drops from 12.3V to less than 12V, shows red , pops back up to 12V and shows green and back again. Engine on shows 14.2V.
So, its either normal or we both have tired batteries.
Doclees, did you change your battery? 2011 MY Vogue 4.4

Post #435543 21st Apr 2017 12:00pm
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doclees



Member Since: 25 Jun 2015
Location: PA
Posts: 393

United States 2004 Range Rover HSE 4.4 V8 Java Black

No I haven't changed the battery. I get 12.3 v across the terminals and it stays there through the night. The instrument cluster reads 12.3 v on startup too.

Post #435555 21st Apr 2017 3:14pm
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berkshirelad



Member Since: 06 Apr 2016
Location: Newbury
Posts: 152

United Kingdom 2007 Range Rover Vogue SE TDV8 Tonga Green

doclees wrote:
Can't read the battery year. I'm guessing about 3 yrs old. PO would have put in new battery when purchased in parts. Resting volts across terminals is 12.33v. Only thing drawing power is the LED on the USB charging outlet.


Not so, A great deal of electronics remains powered in order to accept commands (eg central locking, alarms, etc.)

Post #435862 25th Apr 2017 2:19pm
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doclees



Member Since: 25 Jun 2015
Location: PA
Posts: 393

United States 2004 Range Rover HSE 4.4 V8 Java Black

Yes I get that. I mean obvious things. Thanks though.

Post #435931 26th Apr 2017 2:47am
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