Have you checked the condition of the wires at the Alternator? For
example, that little blue wire? If that is corroded, it won't allow
for the alternator to set up the proper magnetic field and you won't
be getting a charge out of it. I have one Vanagon where I started to
investigate the wiring and the connector on that blue wire fell right
off the wire. Stripping back the wire to find some good copper for a
replacement connector I found almost the entire length of wire showed
corrosion.

On Jan 5, 2008, at 8:36 PM, Kai Mei wrote:

> I'm reading 13.4v at the battery terminal engine and alt working. So
> ~2.23V for each cell.
>
> Can a car battery even charge to 100% like this? Let alone 2
> batteries, of mixed use (deep cycle, starting)
>
> Somewhat rhetorical, I know my batteries get some charge, but still
> seems less than optimal. With my slow starter I'm going to need all
> the help I can get.