From: "Tracy Crook rwstracy@gmail.com" <flyrotary@lancaironline.net>
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Date: Thu, 2 Aug 2018 16:40:42 -0600
Subject: Re: [FlyRotary] Re: Alternator Damaged - Internal Short
Message-Id: <A0821850-697F-455B-9DF0-89596CF816CD@gmail.com>
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In-Reply-To: <list-11471135@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Yep, just like all those cars on the road.

Sent from my iPad

> On Aug 2, 2018, at 15:57, Finn Lassen finn.lassen@verizon.net <flyrotary@l=
ancaironline.net> wrote:
>=20
> You have a wire directly from battery to alternator B+ ?
>=20
> Finn
>=20
>> On 8/2/2018 2:15 PM, Tracy Crook rwstracy@gmail.com wrote:
>> Nothing, just direct wired.  Not saying a fuse wouldn=E2=80=99t be a good=
 idea though. Like someone already said, something just over the alternator r=
ating.  You are protecting against internal short to ground alternator failu=
re.  It would not protect against overvolt failure though.  Those are pretty=
 rare.
>>=20
>> In your case, the solenoid may have both caused the alternator failure an=
d then acted as fuse to protect against shorting the battery to ground.
>>=20
>> Tracy
>>=20
>> Sent from my iPad
>>=20
>>> On Aug 2, 2018, at 11:02, Jeff Whaley jwhaley@datacast.com <flyrotary@la=
ncaironline.net> wrote:
>>>=20
>>> Hi Tracy, that is an interesting comment.  Sounds like a fuse would have=
 been a better bet than the alternator solenoid - but what do you replace th=
e battery solenoid with?
>>> Jeff
>>>=20
>>> The sequence of failure is a question.  The relay failing and going open=
 might have been the first in the chain.  Many alternators will fail interna=
lly when all load is removed due to over volting.  Most Automotive alternato=
rs were not designed for no load operation.
>>>=20
>>> I've never been an advocate for either battery or alternator solenoid us=
e.  They cause more problems than they solve.
>>>=20
>>> Tracy
>>>=20
>>> -----Original Message-----
>>> From: Jeff Whaley
>>> 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); orbiti=
ng the airport, the cooling wasn't too bad but while waiting for the temps t=
o stabilize I smelled smoke so landed immediately.  Saw a bit of smoke exiti=
ng the oil cooler plenum so thought I was baking some fiberglass.
>>> On the weekend I did a more thorough inspection and found the battery ma=
ins cable burned where attached to my alternator cut-out relay and the relay=
 fried to the point that the input terminal was loose.  The connections stay=
ed in place but open-circuited the relay - so the engine never skipped a bea=
t and I was unaware there was an electrical problem at the time. Only report=
ing this now as it took me a while to get the alternator tested.
>>> Jeff
>>>=20
>>> --
>>> Homepage:  http://www.flyrotary.com/
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st.html
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/Lis=
t.html
>>=20
>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
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