At 08:54 PM 11/3/2009, you wrote:
>
>Hi!
>
>I am mounting my filter capacitor and alt disconnect relay on the
>cool side of the firewall. Voltage regulator and battery would be
>FWF. One alternator lead would go through the firewall to the COM
>terminal of the alt disconnect relay. From the regulator, one ltblu
>wire, the red wire, and the yel wire would go through the firewall
>to the filter capacitor. From the filter capacitor, there would be
>one wire come back through the firewall to the starter contactor.
>This is how I'd planned it a few months ago. The only changes were
>to downsize the wires.
>
>But today, I ran across the following on the US Jabiru website:
>
>We suggest keeping the red and yellow wires ahead of the
>firewall. We run them directly but separately to the battery.
>
>This differs from how I have it, since my red and yellow wires are
>not kept fwf. And they are not run directly to the battery, but go
>first to the filter capacitor, starter contactor, battery contactor
>and then to the battery. Is there any problem doing it how I have it?
>
>
>I also noticed in the Z drawings with the Jabiru regulator, Bob
>shows two grounds, one from the black wire and another drawn between
>the voltage regulator box to the firewall. I'm wondering if this
>ground drawing should be deleted.
It depends on the specific regulators . . . some regulators
require an electrical case ground for proper function
so I always show it . . . if the critter is mounted to your
conductive firewall, then it IS grounded whether electrically
necessary or not.
> The voltage regulator metal case certainly contacts the firewall, fwiw.
Yes . . . that's what that symbol is about.
You're mixing multiple recipes for success together
with predicable consternation. There's no good reason to
have just the relay and filter capacitor on the
cockpit side of the firewall. Good practice calls
for minimizing firewall penetrations.
If it were my airplane, I'd put all the alternator
stuff forward of the firewall and bring a
minimum of power distribution and control wires
through to the cockpit.
Bob . . .
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