DC DC Chargers

Submitted: Tuesday, Aug 26, 2014 at 10:13
ThreadID: 109286 Views:2931 Replies:5 FollowUps:3
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Please be gentle I,m trying to get my very basic knowledge arround my probelm.Background Car is a Ranger xlt and I,ve had a 2rd battery put in the tub which runs 110 Waeco drinks fridge and this is connected to a DC DC charger. My understanding is Alternator charges main bat DC DC charges 2rd bat from the main all good .The main bat after 30/36 hour of just sitting drops to 11.79 volts still starts the car which Ford dealer says voltage drop with the alarms computors ect is accepable and designed to do that .
Now should the DC DC charger stop topping up 2rd bat when the ignition is off ??.
Ford say with the negative off the 2rd bat draw on the main is .002ma when connected draw on the main rises to .17ma which they claim is excessive my Auto Electy say thats not to bad .
The above voltage drop is only when the 2rd bat is being used as at the moment the 2 rd is full charged and the main is holding 12.3 v
I trust my auto elecy more than the ford dealership.
I,ve expalined it as best I can so do I have a probelm or are all makes with computors ect ect suffering from the same issue.
Thanks
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