[bugman]

Yes it will

Other than a regular charger look at a Battery Tender. I have my truck, car, and ATV on separate ones. And they are better for your batteries that a regular charger.

 

[bugman]

I am sure that if there was enough of a imbalance with charging the battery that is under the van the Ford engineers would of addressed that by running a charge wire from the alternator to both batteries, instead of just the top battery.

 

[bugman]

I thought the issue was trying to charge two batteries. I did a simple voltage test on my Toyhauler with 3 - 12 vdc batteries. They were setup from the factory as the unbalanced drawing shows. I checked the voltage on all three and the result was as shown in the drawing. I changed the Toyhauler battery cable wiring to balanced and sure enough all three were exactly the same voltage. It really isn't b.s. I also have a 50' Skyjack lift with 8 very very deep cycle batteries. They are factory wired as balanced. I was actually surprised someone does things right.

Your problem is that it is impracticable to wire dual batteries in a automotive situation this way.

You can do it in a RV is one thing, but your examples do not show where to connect the load such as you will have in a truck with dual batteries that depend on both batteries for starting.

 

[bugman]

I agree, that is why is said charge each battery one at a time. Putting a charger on one battery and thinking it will charge both the same will not work.

It'll work quite well, it has for as long as he has owned the van. Remember we are talking automotive and not RV. As long as the battery cables are up to snuff both batteries will charge.

 

[bugman]

Then explain this, how did the batteries charge from the factory in vehicles with dual batteries?

In all the applications that I have seen there is one battery that isn't connected directly to the alternator. and the ground on that battery is connected to the block of the engine in the most direct route, same as the battery that is connected closest to the alternator output.

Remember we are not just charging the batteries in a lab situation but in a vehicle.