On Tue, 19 Feb 2008 09:32:59 -0800 (PST),
wrote:

On Feb 18, 9:15 pm, Sliker wrote:

That's what he does it for, to reduce the noise from the B lead, from
what I gathered reading his book.
Rich

The output side of the master contactor, and input side of
the starter contactor, are wired together and the bus is also
connected to that same point, so it will make no difference at all in
terms of noise filtering. The only difference will be a wrong-reading
ammeter, since the ammeter is installed between the master contactor
and bus, and electron flow during discharge is from the bus, through
the ammeter, and via the contactor to the battery. Connecting the
alternator to this point will have electon flow from the bus, through
the ammeter, to the alternator via that same path, making it show a
discharge at all times when the alternator is running. I don't think
you want that. If the alternator is connected to the bus (through a
breaker), the electron flow runs from the battery (backwards, so it's
charging) to the contactor and, through the ammeter to the bus and
from there to the alternator. The ammeter properly shows a charge,
since the flow is reversed, now. Isn't that what you really want?
Scroll about halfway down this page to the diagram without the
the overvoltage sensor:
http://ronkilber.tripod.com/alternat/alternat.htm
See how the alternator is connected. And see what would
happen if it was connected instead to the contactor.

Dan

That's exactly the way I want to hook it up. Although, I do remember
in reading Bob's book that with that setup he suggests hooking up the
amp meter between the batteries ground post and the ground bus to get
it to read right. But I'm just going to run the alternator wire
directly to the main bus through a breaker and use shielded wire. If
the shield does it's job, the noise should be grounded out. I even
noticed that some of the later wiring diagrams from B&C show the
alternator wire connecting to the starter contactor. So they are in
agreement with Bob on that one. But that's just one way to do it,
there are others. The wiring diagram I like best is the one in The
Sportplane builder and in Firewall forward, by Tony Bengilis. And
thank goodness in his book he shows how to wire my Bendix shower of
sparks mags. That's the only place I've found that wiring diagram.
Although, after looking at it, it's pretty simple. I had thought that
the shower of sparks mags were really modern, until I read a similar
system was installed in the Model A Ford. :-)

Rich