dual battery system navara d40
Submitted: Saturday, Mar 24, 2012 at 09:44
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streamlite
After many headaches!
I have found that Standard dual battery setups do not work on the latest Navara due to the fact that the alternator rate of charge is set by the computer and can fluctuate anywhere between 11.9v to 14.9v constantly.
this means you are unable to connect the starting battery and aux battery together as in other vehicles.
solution is a 12v to 12v battery charger available from Redarc code BCDC1220 has been designed to allow for variable volts and works from ignition.
I had many issues with my navara as had wired it up for dual battery, even took it back to nissan several times as voltage is so erratic but this seems to be the trend for newer vehicles, so hope this is of help to navara owners
Reply By: GT Campers - Saturday, Mar 24, 2012 at 20:56
Saturday, Mar 24, 2012 at 20:56
yes Projecta, Redarc et al have 12V-12V chargers, they are intended for voltage boosting for remote house battery charging, doesn't explain (to me, anyway!) why the alternator:
a) won't charge a second battery, and
b) why you are seeing 11-ish V etc anywhere in the vehicle system
AnswerID:
481291
Follow Up By: Member - DEREK K - Sunday, Mar 25, 2012 at 09:00
Sunday, Mar 25, 2012 at 09:00
MY 2005 nav is putting out 14.2 volt but at second battery it was only about 11v so i checked the earth and that was the problem , now i get 13.9v at battery at rear of vechile
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Follow Up By: streamlite - Sunday, Mar 25, 2012 at 11:42
Sunday, Mar 25, 2012 at 11:42
Nissan have checked my 2011 Navara stx(now 8000 klm on clock) twice and have told me charging rates are normal.
So on start up normal voltage steady around 14v after 3-5mins driving voltage will drop to 12v/12.2v and then fluctuate, could stay at 12v/12.2 for 10 mins then increase to 14v then drop away almost as quick, so because of this normal systems won't work as they would be constantly switching off
A rep from redarc was at
Adelaide show and demonstrated their new product that addressed this issue, that is will fully charge aux bat while input volts can be what ever.
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756698
Follow Up By: LeighW - Sunday, Mar 25, 2012 at 20:15
Sunday, Mar 25, 2012 at 20:15
What does the vehicles voltage look like on the main fuse box, if the voltage
is vary that widely I woiuld have thought it would be causing other issues, ie lights
vary in brightness, radio, fan speeds etc?
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Follow Up By: GT Campers - Sunday, Mar 25, 2012 at 21:57
Sunday, Mar 25, 2012 at 21:57
yeah, although a low system voltage will cause the isolator to unhitch - as intended - your system voltage won't drop below the battery voltage. as Leigh hinted, are the lights etc flickering
Bit of an odd one!
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