[Public-List] Bizzare electrical problem

[Glennb]

Iam going to look at that closely tomorrow - when the spring monsoon lets up  here in the PNW.

Gpb

Sent from my iPad

On Apr 7, 2013, at 6:16 PM, n4lbl <alan.schulman at gmail.com> wrote:

> 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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