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<DIV><FONT size=3>James,</FONT></DIV>
<DIV><FONT size=3>I've found that some rubber compounds are conductive. For
instance when I tried to electrically insulate with a piece of inner tube from a
tyre, it still passed current.</FONT></DIV>
<DIV><FONT size=3>Jim</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 7/27/2015 7:14:28 A.M. Central Daylight Time,
personal_submersibles@psubs.org writes:</DIV>
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<DIV dir=ltr>No. Just sat on the trailer.</DIV>
<DIV class=gmail_extra><BR>
<DIV class=gmail_quote>On 27 July 2015 at 11:58, Alan via
Personal_Submersibles <SPAN dir=ltr><<A
title=mailto:personal_submersibles@psubs.org
href="mailto:personal_submersibles@psubs.org"
target=_blank>personal_submersibles@psubs.org</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">James
were they in the water?<BR><BR>Sent from my iPad<BR>
<DIV>
<DIV class=h5><BR>> On 27/07/2015, at 10:33 pm, James Frankland via
Personal_Submersibles <<A title=mailto:personal_submersibles@psubs.org
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>>
wrote:<BR>><BR>> Hi All<BR>><BR>> I have a very peculiar
issue. I have an earth fault on the boat.<BR>><BR>> My test
consists of holding one probe of the meter on the positive battery terminal
and the other to the hull somewhere. I was showing a reading of
24v. So obviously a negative connection somewhere to the
hull.<BR>><BR>> I went around everything taking things off and have
tracked the fault down to the lights.<BR>><BR>> The lights are the
trustfire ones and the negative connection is grounded to the chassis of the
light. However, when I fitted the lights, I was aware of this and so
insulated the mounting bracket from the light casing itself with a
piece of rubber. So theoretically, there is no physical connection
from the case to the hull. Only the internal wire.<BR>><BR>>
Anyway, if I disconnect the lights and leave them dangling on their wires,
there is no earth fault. The lights all work, and the hull is clean of
current.<BR>><BR>> So the lights must be leaking back through the
connection somehow, but I cant see how. The case is insulated from the
mounting bracket with rubber and the brackets are connected to the
fibreglass faring, so it shouldn't leak back?<BR>><BR>> Anyway, ive
fixed it by insulating the mounting bolts with delrin washers, but I cant
see how the earth could return through a piece of rubber and then glass
fibre. A mystery unless anyone can see something
obvious?<BR>><BR>> Regards<BR>>
James<BR>><BR>><BR></DIV></DIV>>
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