On Feb 18, 12:08 pm, Sliker wrote:
I'm wiring the electrical system in my Glasair 3, and would like to
know how most builders wire the alternator. It seems every diagram I
get from Bob Nuckolls shows the alternator supply wire (B) connecting
to the input side of the starter contactor. But the wiring diagrams
from B&C show the B wire going directly to the supply or main bus
through a circuit breaker of appropriate amps. The main difference I
see is with Nuckolls method, the alternator has to send it's current
through the battery contactor. Where as the B&C diagram bypasses it
and goes directly to the main bus. Which is better?

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The input side of the starter contactor is connected to
the output side of the master contactor, and a heavy line goes from
that same point to feed the bus through the ammeter. Connecting the
alternator to that terminal will run all its current through the
ammeter, which you don't want. The ammeter would show a discharge even
though the battery is charging.
Run the line to the bus, through a breaker. The ammeter will
then read properly, and you will have a protected circuit.

Dan