D4 Alternator Question

**Redback** · 14th November 2011, 12:29 PM

I've done a search with no success, I was looking for the thread on how the D4 alternator works, it was posted that it stops charging at a certain speed, is it the 2,7l or 3.0l they were refering too

Baz.

**discowhite** · 14th November 2011, 03:41 PM

it was both? i think, and its only supposed to charge when your off load (coasting)?
the thread was a bit vague...
in relation to what do you need to know about the alt?
touch wood i havnt had any dramas with mine, it seams to do all thats
required of it.

cheers phil

**roamer** · 14th November 2011, 04:18 PM

Hey Baz
If you have the touch screen/nav, you can put up the secret screen,

and there is a section there for "Vechile Signals", which will give you voltages.

Cheers Ken

**drivesafe** · 14th November 2011, 05:34 PM

Hi Baz, the 2.7L’s alternator works like the D3.

The 3.0L is the one that, after the initial boost charge when you first start the motor, the voltage goes down while the motor is under load and rises as the load reduces, such as when coasting.

**RoverLander** · 14th November 2011, 08:03 PM

I agree with the above. The only thing i can add is that after the initial charge the car will operate at different voltages while cruising. This may vary between as low as 12.3 and 14.7. I have observed this over some 12 months on my d4. I have no idea why. Could it be some sort of battery conditioning algorithm?

**irondoc** · 14th November 2011, 08:54 PM

my 2011 2.7 D4 sits between 13.7 and 13.9 volts all the time. occasionally i see 14.0 or 14.1

cheers
lucas

**Stuart02** · 14th November 2011, 10:04 PM

Originally Posted by roamer

Hey Baz
If you have the touch screen/nav, you can put up the secret screen,

and there is a section there for "Vechile Signals", which will give you voltages.

Cheers Ken

Tell, tell! Where's the secret screen?

**roamer** · 15th November 2011, 06:37 AM

Originally Posted by Stuart02

Tell, tell! Where's the secret screen?

If you have nav\touch screen, put it on Home Screen", there is a grey bar at the top, hold finger in centre of bar for 3sec,then hold finger at left hand side of bar (on H ) for 6 sec till it goes to code screen, code is 753.
From there all sorts of stuff , bring camera on while on the move forward, Vehicle Signals, which oddly the speed reading is correct (ie not 5k\h fast like speedo).

I think the varible alternator has to do with load on motor, hence drops down when under load to save fuel\lessen pollution (more reason for carbon tax rebate,yeah sure)

Cheers Ken
Maybe this should go in FAQ under cool stuff

**Redback** · 15th November 2011, 07:00 AM

Thanks everyone.

Robert, maybe put this info in FAQ.

Baz.

**baldivistribe** · 19th December 2011, 11:48 PM

Hi all
Have had our Discovery for a month now and am constantly getting the low voltage stereo will turn off in 3 minutes thingy. We brought the vehicle home from Albany (4 odd hour drive) i would have thought the drive would have charged the vehicle battery enough not to get the warnings. I have since stuck my cteck 5 amp charger on and left it on for 2 days (took overnight to progress through the stages). Now i have just flicked my solar panel on the battery and the regulator today showed a SOC of 80%. I would have thought the Alternator would have done a better job of charging the battery. I would hate to go camping and leave the fridge on for a couple of days. My queries are does anyone have an understanding of how the alternator works. The so called secret screen just how exactly does this work as i have tried this evening to no avail. I have the black bar at the top of the screen.
Cheers
Steve

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