[Public-List] Bizzare electrical problem

[n4lbl]

I'd be really interested in the quality of the starter battery ground.
On Apr 7, 2013 2:09 PM, "Glennb" <brooks.glenn at comcast.net> wrote:

> Yep, thats kind of what I though.  So far as I know, the hull was dry,
> except for sitting in the water at the slip.  iam going to go check for a
> short or ground to,the pushpit tomorrow. Still amazed a heavy gauge
> shielded coax cable would heat up three feet away from the radio as well as
> the back side of the radio, with no damage to any of the much smaller
> ground or positive wires leading to the  radio, or nearby parts of the
> wiring system...
>
> Maybe iam thinking along the wrong lines.  Perhaps the impedance ran up
> the radio ground wire from the negative bus to the back of the radio,
> thence started to cook the coax? The radio,itself still works and only the
> heat sink on the back and rear part of the frame was hot.  Maybe had
> nothing to do with the pushpit - which i still believe is isolated from the
> electrical system, except for the emergency antenna clamps.
>
> Still Weird!
>
> Glenn
> Dolce 318
>
> Sent from my iPad
>
> On Apr 7, 2013, at 12:23 PM, Gordon Laco <mainstay at csolve.net> wrote:
>
> > The glass in the hull can't carry a current, but moisture on it
> certainly can.
> >
> > On 2013-04-07, at 1:53 PM, Glennb <brooks.glenn at comcast.net> wrote:
> >
> >> I can see stray electrical currents, but can fiberglass hulls conduct
> enough electrical energy to heat coax antenna cable to the melting point???
> Never thought that was possible.
> >>
> >> Btw,  i havent looked into the battery compartment yet - under the
> cockpit behind the engine- but everything is new back there this past year.
> Plus I did hose off the engine last spring as part of a serious cleanup
> following a lot of FG and wood sanding .
> >>
> >> Gpb
> >>
> >> Sent from my iPad
> >>
> >> On Apr 7, 2013, at 8:54 AM, n4lbl <alan.schulman at gmail.com> wrote:
> >>
> >>> That was true, but,,,,
> >>>
> >>> http://www.thebatteryterminal.com/TechTalk_Batteries_on_Concrete.htm
> >>>
> >>> http://www.snopes.com/autos/techno/battery.asp
> >>>
> >>>
> http://www.cartalk.com/content/business-batteries-and-concrete-floors-needs-be
> >>>
> >>>
> >>> On Sun, Apr 7, 2013 at 9:19 AM, Don Campbell <dk.campbell at xplornet.ca
> >wrote:
> >>>
> >>>> That is the quickest way to drain a battery that sits without being
> >>>> recharged,  and if you set a battery onto concrete,  this is the way
> charge
> >>>> is lost to ground, i.e. through condensation between the battery and
> the
> >>>> concrete. By setting the battery onto a piece of wood,  that breaks
> the
> >>>> continuity of the water film and so maintains the charge in the
> battery.
> >>>>
> >>>> Don
> >>>> On 4/6/2013 2:31 PM, Gordon Laco wrote:
> >>>>
> >>>>> That's good advice.   I once had a shock (pun intended) when I
> casually
> >>>>> touched the probe of a multimeter to the inside skin of my boat
> while the
> >>>>> other probe was touching the SIDE of one of my batteries.    There
> was a
> >>>>> slight current.    I noticed everything was damp with condensation.
>   I
> >>>>> dried everything I could reach and was able to kill the stray
> current, at
> >>>>> least so far as my meter could detect.   If ever there was a good
> reason
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