Auxiliary Battery Wiring

Hi Brian

What else is connected to the aux battery ?

Was the Redarc 'off' ?

Was the Redarc 'warm' ?

You may have a drain via a few items...

Spotlight relay, 2 way radio, brake controller, radio memory function, trailer plug.

I would also be worried if an Engel flattened both the aux and main batteries in just 2 days. There must be a big drain somewhere. Would suggest and amp test using a multimeter.

Regards

Derek from ABR

Are you sure you have the batteries connected to the correct terminals on the Redarc. Easy to hook them up around the wrong way That would run the start battery flat.
If I remember rightly the little black box goes up if the terminals are mounted 1 above the other say on the inner guard. And the start battery goes on the top one.
Easy way to check is turn the lights on full for 10 mins and see which one drops voltage.
Hope you put a fuse in the new wire and used at least a 6mm2 wire and an equal weight neg Not much good having one smaller than the other

Too wet to go out and check mine tonite.

Cheers

Gday,
A mate had a similar problem a while ago and we stuffed around for a couple of days trying to work it out........Problem is I cant remember exactly what it was. BUT.....
I think what his come down to was a crap earth?....It wasn't so much loosing charge but never getting enough to start.
The earth tested fine but when we put the multimeter directly on the battery it was heaps better???
I think we put it down to, and then heard latter that Nissan's had a problem with using an earth off the engine rather than a good clean earth off the body.????
Sorry...cant remember exactly what it was but if no one gives you anything better to try ...Ill find out.

Cheers

Brian,
you say "have checked the Redarc is opening and closing at the correct voltages" so no problems exist that can be associated with the fitting and/or working of the Redarc isolator ??

You say the problem is ""the starting battery going flat, as well as the auxiliary battery"" this does indicate the two batteries are still (somehow) connected in some way, if the Redarc was separating the two batteries there is no way the original cranking battery would loose power that can be attributed direct to the Engal fridge, because the battery isolator is the only direct connection between the two batteries.

Small voltage drop associated with things like radio's and interior lights may also contribute to the power loss in the cranking battery, this is not associated with the fridge and will be lost even when the fridge is NOT connected, so you would see it daily, not only when the fridge is connected.

My suggestion: recheck the battery isolator is working correctly !!

Mainey . . .