Losing battery power

[herbie]

I am in need of advice from the more technically minded and experienced members of this forum - also possibly references of companies who can help me sort out my problem.

I have a dual battery system with National Luna solinoid system and monitor in my vehicle. For about 3 weeks now I have noticed that, if I do not use the vehicle for 3 or 4 days, both batteries will lose charge to the point where the monitor only shows red lights for both - maybe 1 yellow light. When I drive, it charges immediatly and runs right up to all the green lights. Next time it stands for a while - same thing.

This weekend we went camping and it became even more confusing. Whilst running just my N/L weekender off the second battery, it would lose it's charge down to the point where one yellow light is on at the dual battery system monitor within 6 hours (second battery is 70Amp Deltec deep cycle about 9 months old). The fridge - with own built in monitoring system - would also run down to one orange light only showing that incoming power is getting low.

At one point I plugged in a light as well and suddenly all the yellow lights came on on the fridges monitor - lots of incoming power - still only one on the dualbattery system monitor. From then on the fridge's monitor would fluctuate between 1 and 7 yellow lights with nothing else changing. The battery monitor stayed down at one light.

Before the weekend, I had both batteries tested at 2 seperate Battery centres and they told me it was in perfect condition. The alternator also seems to be fine as both batteries charge strongly when the car is running. The battery management brain and solenoid is brand new and was tested - switches on and off perfectly as it should.

What can it be? My logic - not knowledge of electrical matters - tells me it must be losing it's charge somewhere else - "leaking power". Why do both discharge? Is this something a good auto electrician would be best suited to sort out or will a specialist 4x4 installation centre be better. Had it at Safari Centre in Cape Town and other than confirming that the management system and solenoid works they could not help any further.

Wow - that is a mouthfull for a Monday morning, but such is my confusion and frustration at this point! Any advice would be highly appreciated -I need to sort this out before easter!

Thanks

Andre

[Dangaboy]

Do you have a Tracker (similar) in your 4x4?

[herbie]

no, I don't have one.

[Jako]

My NL system is doiing exactly the same! I thought the monitor was faulty, now I don't know!

[herbie]

You should still have yours checked - might just be a coincidence that the symptoms are the same.

[Jako]

My solenoid and controller is a month old

[BUSH 1]

Moemfie is your soleniod disengading if the voltage drops to below 13.1 volt you will be able to see this on the seloniod green light will switch off ?