Hello,

i am looking to fit a 2nd battery in the boot and have read the various threads on here about it.

What i would like to do is use a VSR as referenced here: http://www.fullfatrr.com/forum/topic19898....ry+fitting by Barracuda186.

i would like the vehicle ECUs to run off the aux battery (connected via VSR) rather than the main battery so if they flatten the aux battery the main battery will still have charge which could be used via a switch to power the ECU (bypassing the VSR) B186s post is exactly what i am trying to achieve.

The issue i believe i have is with some differences with the 10MY setup.

I have four cables to the +ve terminal.

one off the bottom of the pyro to the s/m i believe
one (a) that goes to the negative terminal via a plug
one (b) that goes to the rear fuse box (where the 2nd battery is installed (with fuse))
one (c) that if it doesnt have 12v on it the computers dont come on.

i had hoped to put a + b + c together on one side of the VSR, which i thought would mean with the 12v aux battery connected to the rear fuse box would utilise cable 'b' and feed the power to cable 'c' for the computers.

i tried this. With a + B + C disconnected from the main battery i had 12.6v at the the rear fuse box connection when the aux battery is connected up.

Not much help to you but if you must ratchet strap your batterie down , use a polyester strap and not that nylon type . Nylon has no resistance to acid .
Here is some good info from our side of the globe on fitting second batteries and Drivesafe is on FullFat as well .
http://www.aulro.com/afvb/projects-tutoria...ation.html 2008 MY Supercharged
Rimini Red / Jet
four zone climate
remote park heater
and no ugly kid windows.
magnus satis quod turpis satis

+1 for the above link as I have done that to my FF and run most of my ancillary equipment from it.

Only change I would make is to reorder the steps and attach the 2nd battery +ve first before the z bracket (and also before the -ve on the 2nd battery), otherwise when moving the relay and cable into position it could short to the bodywork/etc..

One of the best features of this kit is that the VSR doesn't disconnect the batteries when the alternator isn't running until the voltage drops below a lower threshold which has the advantage of letting the fast charging yellow top charge up the main battery after you are parked up. Current: RR L322 2010
Past: RR L405 2017, RR L322 2012, 2008 & 2004, 2018 D5, 2016 Defender, 2011 D4, a few Disco2s, P38, RR Classic, couple of Disco1's, SIII SWB

thank you for the ratchet strap tip.

yep i had seen that thread already when googling.

as i understand it though it doesnt run the vehicle , it just allows the use of 2nd battery to power the rear aux socket. Cheers

James