From: "Tracy Crook rwstracy@gmail.com" <flyrotary@lancaironline.net>
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Date: Thu, 2 Aug 2018 12:15:40 -0600
Subject: Re: [FlyRotary] Re: Alternator Damaged - Internal Short
Message-Id: <E4709C6B-A1B0-47E7-A612-B65C69447534@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Nothing, just direct wired.  Not saying a fuse wouldn=E2=80=99t be a good id=
ea though. Like someone already said, something just over the alternator rat=
ing.  You are protecting against internal short to ground alternator failure=
.  It would not protect against overvolt failure though.  Those are pretty r=
are.

In your case, the solenoid may have both caused the alternator failure and t=
hen acted as fuse to protect against shorting the battery to ground.

Tracy

Sent from my iPad

> On Aug 2, 2018, at 11:02, Jeff Whaley jwhaley@datacast.com <flyrotary@lanc=
aironline.net> wrote:
>=20
> Hi Tracy, that is an interesting comment.  Sounds like a fuse would have b=
een a better bet than the alternator solenoid - but what do you replace the b=
attery solenoid with?
> Jeff
>=20
> The sequence of failure is a question.  The relay failing and going open m=
ight have been the first in the chain.  Many alternators will fail internall=
y when all load is removed due to over volting.  Most Automotive alternators=
 were not designed for no load operation.
>=20
> I've never been an advocate for either battery or alternator solenoid use.=
  They cause more problems than they solve.
>=20
> Tracy
>=20
> -----Original Message-----
> From: Jeff Whaley=20
> Sent: August-02-18 10:41 AM
> To: Rotary motors in aircraft
> Subject: Alternator Damaged - Internal Short
>=20
> Last Thursday I decided to try my cooling on a hot day 32C (90F); orbiting=
 the airport, the cooling wasn't too bad but while waiting for the temps to s=
tabilize I smelled smoke so landed immediately.  Saw a bit of smoke exiting t=
he oil cooler plenum so thought I was baking some fiberglass.
> On the weekend I did a more thorough inspection and found the battery main=
s cable burned where attached to my alternator cut-out relay and the relay f=
ried to the point that the input terminal was loose.  The connections stayed=
 in place but open-circuited the relay - so the engine never skipped a beat a=
nd I was unaware there was an electrical problem at the time. Only reporting=
 this now as it took me a while to get the alternator tested.
> Jeff
>=20
> --
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