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Old 3 Mar 2010
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24v Battery Booster Recovery system's OVERLANDING

Howdy All

Can anyone Help Regarding a worse case scenario of flat batteries 24V
we are looking at idea's of recovery system's when the vehicle will not start.

There is load's of dual 12v & 24v jumpstarter's but are they any good
to use while overlanding they can be charged on cigarette lighter etc.

All advice will be greatly appreciated...

Thank You....
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Old 3 Mar 2010
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Hi - I overlanded in a LC80 with 12-24v electrics


I did have to use jump leads to start it a few times when the batteries were on their way out. I never had a case where both batteries were stuffed simultaneously, but each time it happened I was able to get it going with a 12v donor vehicle connected to the left-hand battery (as you stand at the front of the vehicle facing the back).

I would need to understand more about how the 12v/24v switchover works before advising you to connect a 24v supply across the positive of one battery and the negative of the other, though - maybe others on this forum can shed some light.
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Old 3 Mar 2010
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One of my batteries died on my hdj80 in Algerian desert this year (vibrations ...) so we used jump leads connected to hilux battery (single battery) on one side and to the poles of died battery on the other side and the engine stated ok.
So as far as I know the only "bullet proof" backup would be to have two spare batteries which is not really an option - but the chance that two of them will die together is rather small so a single spare battery should be ok.

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Old 3 Mar 2010
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It may be prudent to take along a second set of jump cables, even small cheap ones. You can boost a 24v vehicle using the 12v batteries of two other cars. I can't remember the particulars of the boosting procedure (it has yet to come up with my 24v Cruiser). Mine is completely 24v so it will be different than your 12-24v system but a set of jumpers attached to each battery should do the trick.
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Old 3 Mar 2010
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Originally Posted by ilesmark View Post

I would need to understand more about how the 12v/24v switchover works
Here is how it works in a RHD vehicles:
Attached Thumbnails
24v Battery Booster Recovery system's OVERLANDING-12-24v-switch.jpg  

Roman (UK)

Last edited by Roman; 6 Mar 2010 at 09:37.
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Old 4 Mar 2010
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Interesting. Is this the same for the Japan-spec ones?

I no longer have a Landcruiser, but a friend still does, so I am forwarding him the link to this.

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Old 5 Mar 2010
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When I bought my 80 series it had been standing a long time and the batteries didn't hold charge for very long.

When they were both flat and unable to turn the engine over, a jump start from a 12v single battery car, or a 12v boost box, attached to the drivers side battery started it every time.

I was advised by someone with a lot of experience and knowledge of 80's to only ever jump the drivers side battery.

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Old 13 Mar 2010
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It does seem to be that the batteries rarely fail at the same time but it is in order to ensure the 'best' battery is put to the left of the car (as per sitting in the drivers seat) and then jump the suspect battery on the right.

When you connect the leads and run the doner vehicles engine for three or four minutes you do charge both batteries as I am sure they are in parallel when engine is not cranking.


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