Do I need a DC/DC charger in my 105 Landcruiser

Enormous Racing
As your auxiliary battery is located under the bonnet it will work well with just a decent VSR (Voltage Sensitive Relay) type isolator and good heavy cables.
Regards
Athol

We have the good ol ARB solenoid style dual battery system in the 105 and a 5 stage do dar do dar wipes your bum DC/DC dual system in the Prado. In both cars the morning after running both fridges all night the aux batteries are 11.5 volts. So there is no difference between our systems at all. Once you start adding in losses due to under voltage and over current I can't measure the difference.

Enormous

The good thing about the 105 is its simplicity.

I use a Baintech like this one.

Baintech Dual Battery Setup

Works well - simple as - don't even know it's there - joins the batteries at the flick of a switch if you need the extra boost to get going.

Cheers

Anthony

Thanks for your replies. I was just about to fork out some cash for a Redarc 1225 or 1240 but thought I should just do a bit more research. There's so many forums on this but none seem to be specific to my situation. I might set one up in the camper trailer eventually.

Hi Enormous , I have fitted a C Tek 250s in my 105 series to charge the auxiliary battery as prior to fitting it my battery never reached 100% charge as the alternator will only charge to about 75% as that is what the start battery is needing and then it tapers off .A deep cycle battery needs to be charged to 100% or its life will be short lived .
John

Hi Enormous ,further to my earlier post re DC DC Chargers ,the attached link may be more self explanatory in what a Dc Dc charger does that an alternator does not ,especially in vehicles made after 2007 ,where the alternator is limited in its voltage ,for environmental reasons ,down to 12.7 volts not the 14.2 Volts ,which is there for a short time .
regards John

www.redarc.com.au/images/uploads/.../installing_dc-dc_chargers_ind.pd...

I two have run simple VSR's between my starting battery & deepcycle for over ten years in two Prados. Never had a problem with either battery being charged or lasting five years in both vehicles.
Capt.

I have a landcruiser 4.2 turbo manual with a triple battery set up. Two batteries under bonnet in factory location.a third battery (wet cell deep cycle 100 amp) in the rear of the vehicle,plus cable to tow bar to charge battery on camper.

I use a simple isolator purchased from ABR an advertiser on this site.

At idle, voltage at front batteries 14.3v ,voltage at rear battery and trailer plug 14.2v so no need for dc charger in my opinion.

I have used this setup in all my vehicles over many years without problems.

All the best.