[C320-list] Strange "thunk" electrical noise

[Chris Burti]

Sounds like you have a relay for something in you lighting or charging
circuits.

On Dec 28, 2007 2:27 PM, Bill Culbertson <billculb_a2 at yahoo.com> wrote:

> No it didn't sound like a solenoid as it was more muffled - didn't have
> that "click" sound of a solenoid.  The other thing I forgot to mention last
> night is that it happened about 1/4 - 1/2 second after I switched the
> battery switch - pretty reproducible delay time.
>
>
> ----- Original Message ----
> From: Bruce Heyman <bruceheyman at cox.net>
> To: C320-List <c320-list at catalina320.com>
> Sent: Friday, December 28, 2007 1:05:13 PM
> Subject: Re: [C320-list] Strange "thunk" electrical noise
>
> Bill,
> Strange indeed!  Did the "thunk" sound like a solenoid?  That said the
> only
> solenoids I'm aware of are for the starter, propane and I'm not sure but I
> wonder if there is one for the windlass.
> Bruce
> Somerset #671 SoCal
>
> -----Original Message-----
> From: c320-list-bounces at catalina320.com
> [mailto:c320-list-bounces at catalina320.com] On Behalf Of Bill Culbertson
> Sent: Thursday, December 27, 2007 4:53 PM
> To: C320-List
> Subject: [C320-list] Strange "thunk" electrical noise
>
> I finally made the drive down to the marina yesterday to check on Harmony.
> We'd had a big rain a week back which melted all of the snow and yesterday
> was about 40dF and sunny so it was quite pleasant.  All was well aboard
> and
> it was comfy under her winter cover.  The batteries didn't need as much
> charging as they usually do.
>
> Then as I was closing up shop I shut off the main battery switch and
> remembered something so turned it back on.  There was a distinct "thunk"
> sound.  Strange.  I repeated off, on and each time there was a thunk.
> Location was ambigous but seemed starboard about deck height.  I have a
> Link20 monitor so after I turned off all cabin lights and everything else
> electrical, I could confirm that there was nothing drawing any current.
> In
> that state, I could switch it off and on without the thunk.  But turn on
> one
> cabin light and repeat and "thunk".  Again via Link20 I confirmed that
> only
> one cabin light's worth of curren was flowing when I turned the switch on
> and heard the thunk.  To be certain, I toggled the windless breaker by the
> battery switch (Harmony is #859 and has the switch on the starboard panel)
> to be certain it was disengaged.
>
> I also pulled the starboard cushions and boards to better localize the
> sound
> and to inspect everything in that area.  The sound is not from the settee
> area and I saw nothing unusual down there.
>
> This baffles me and worries me.  I didn't smell anything.  I stuck around
> for quite a while after disengaging everything to see if there was any
> electrical smell or anything to raise more fire worry.
>
> Anyone have ideas?
>
> -bill
>
>
>
>
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-- 
Chris Burti
Farmville, NC