If I connect a CTEK charger to the under bonnet terminal does it charge just the main battery under the spare wheel or does it charge both this and the other one behind the cover at the side of the luggage area?

I also use a CTEK, I assumed it was just the main battery as aren't the terminals under the bonnet the jump start point aswell , however, saying that, I assume the auxiliary battery is charged via either the alternator or via the main battery when the car is running? I would also be interested to know now  Steve

Main car : FFRR L405 Vogue SDV8
Other car : Vauxhall Lotus Carlton
Past cars : FFRR L322 Vogue TD6 SE (Sept 2006 MY07) ; LandCruiser SWB ; 4-Runner ; Supras; XJS V12 LeMans

I would expect so, but not sure - will need to get a meter on them to test it out someday

I have a boat with dual batteries, they are connected via a voltage sensing relay, so as long as the main battery is being charged (above 13.8V I think) then they are connected together and both being charged - however, if the starting battery drops below that, then they disconnect.

I would assume some kind of similar arrangement on the FFRR, but I guess it's possible that the relay is driven via the ignition or something else ?

(there's always a relay as 2 batteries connected in parallel will drain each other over time)

The reason I ask is because my car is sometimes not used for long periods and is kept on a CTEK charger connected under the bonnet. Whenever I use the car after an extended period of it not having moved, the tailgate will not close either with the button on it or with the key fob. I just get a beeping sound and I have to close it manually. After the car has had a good run it then works perfectly. Therefore I was wondering if this was caused by the auxiliary battery running down because it wasn't being charged by the CTEK and was only charged when the engine was running.

I connect my CTEK directly to the battery under the spare wheel. I have fitted a CTEK extension lead to save having to move the spare wheel each time. I have also connected a small solar charger to the same battery when leaving the car for several weeks. No problems whatsoever with either charger. MY23 D350 HSE
On my 7th RR plus various other JLR vehicles

Bearing in mind that the aux battery is connected under the control of the battery monitor, I doubt it. The only way to be sure is to check the voltage across both batteries with your CTEK charger connected.


I'd be interested in the result! Regards,
Mick

'Bertha' - 2014 SDV8 Autobigraphy
'Vincent' - 2010 TdV8 Vogue SE
- 'Molly' - 2005 HSE Auto
'Dixie' - 2000 D2 Td5 ES

Phil

What solar panel do you use out of interest, looking to do the same myself

It’s something like this, but this is probably better than mine. I connect it in the boot and drop it on the rear parcel shelf near a side window. Works fine even if your windows are tinted.

https://www.amazon.co.uk/GIARIDE-Sunpower-...BC8EB2CQAB MY23 D350 HSE
On my 7th RR plus various other JLR vehicles

Why oh why don’t they offer one built into the sunroof to permanently float the battery whenever sunlight is available.
It will be even more desirable in future electric versions., PHEV etc.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

I know this is an old thread but it asks the questions I have. In the manual it only talks of one battery (not two) so that’s my first question do all L405s have two batteries if so where’s the second. As I’m not using it much when I go to start it I get the “low battery -start engine” message. It always starts no problem but as a precaution I would like to connect my c-tek. I’ve always done this using the adapter I got from this site via the towing electric but as the towbar won’t deploy (another story) I need to connect differently - can I just use the jump start connection points under the bonnet.? Geoff

charge from the points in the engine bay ...
not all have a second battery, some do and some have a capacitor..

look in the off side rear cubby and you'll see. ... - .- -.




Y. O. L. O.
.

https://www.fullfatrr.com/forum/topic58249.html

Same info really - just for reassurance

Thanks for this - this weekend just gone was the first time I got the Battery Low - Start Engine message. I've put this down to the particularly cold weather of late.

I've been using it once a week, but make sure it gets a good run out (30-45 minutes continuous driving) - I have a (enjoyable) circular route from my house, via the local farmshop, and back via some excellent A/B roads which gives me opportunity to make sure the fatty gets a good mix of drive/breaking so can only think either the cold weather was getting to it, or the battery is genuinely on its way out (not sure if it is the original one in it).

Might have to dust down my CTEK Current
Vogue SE 4.4 SDV8
Previous highlights
Many Mini's!
Audi S8
Audi A6 Avant (the petrol guzzling Bi-turbo)
Subaru H6 3.0 Estate
Peugeot 406 Coupe V6
Audi 80 Quattro Sport

sorry to jump this thread but hope someone can shed some light or has any suggestions


my mate has a 2014 range rover and changed both batteries in the boot as he was getting low battery messgage and it doesnt get used very often and he didnt buy the from new

anyway just the other week he went to start the car and nothing was happening when pressing the start button

he thought it might starter motor and he changed that but problem still existed - alternator checks out ok too

the car starts via a jump pack on the jump start points under the bonnet but when he connected a multimeter onto the jump points it showed no volts and the last few days the car has been behaving itself

does anyone know if theres a module or junction box underneath he can check / ive told him to check earth connections

thanks in advaance for anyones feedback

It's in the wiki - https://www.fullfatrr.com/gallery/albums/u...cables.pdf