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<DIV>Measure the current of your radio with an external batt; then look for an
ISOLATED 12V (output and input) dc to dc converter with an output matched
to the input current of your radio plus 20%; connect the converter +ve to radio
chassis; this should work but be sure not to mix car volts with converter volts
anywhere ... ! </DIV>
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<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'><B>rg</B></DIV></DIV>
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<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'><B>From:</B>
<A title=alexmm@roadrunner.com>Alex</A> </DIV>
<DIV style="FONT: 10pt tahoma">
<DIV style="BACKGROUND: #f5f5f5">
<DIV><B>Sent:</B> Tuesday, October 24, 2017 5:39 AM</DIV>
<DIV><B>To:</B> <A title=michael.oritt@gmail.com>Michael Oritt</A> ; <A
title=s.hutchings@rogers.com>Stephen Hutchings</A> </DIV>
<DIV><B>Cc:</B> <A title=healeys@autox.team.net>Austin Healey</A> </DIV>
<DIV><B>Subject:</B> Re: [Healeys] Radio,changing from positive ground to
negative ground?</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV><STRONG><FONT face=Arial>Michael, it's not a matter of voltage (12V), but
how much current will flow! High current at low voltages can be
destructive, even resulting in heat and fire.</FONT></STRONG></DIV>
<DIV><STRONG><FONT face=Arial></FONT></STRONG> </DIV>
<DIV><STRONG><FONT face=Arial>== Alex in Maine<BR> "The
Blue Mainie," 1960 Austin Healey 3000 BT7<BR>
"Conkling," 1946 M.G. TC #1321<BR> Former owner 1957 A-H
100-6, 1967 A-H BJ8, <BR> 1965 MG Midget
‹(•¿•)›<BR> <A
href="http://ai2q.org/">http://ai2q.org/</A></FONT></STRONG></DIV>
<DIV><STRONG><FONT face=Arial></FONT></STRONG> </DIV>
<DIV><STRONG><FONT face=Arial></FONT></STRONG> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; PADDING-RIGHT: 0px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=michael.oritt@gmail.com>Michael Oritt</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=s.hutchings@rogers.com>Stephen Hutchings</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A
title=healeys@autox.team.net>Austin Healey</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, October 23, 2017 2:42
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Healeys] Radio,changing
from positive ground to negative ground?</DIV>
<DIV> </DIV>
<DIV dir=ltr>
<DIV class=gmail_default style="COLOR: #3333ff">I believe the antenna must be
shielded as well. This happens automatically with the usual plastic or
hard rubber mounting grommet but should the exterior of the antenna somehow
touch either bare metal on the body or elsewhere a short will likely
occur. It's only 12 volts so it won't be harmful but it will certainly
get one's attention if the connection is good enough.</DIV>
<DIV class=gmail_default style="COLOR: #3333ff"> </DIV>
<DIV class=gmail_default style="COLOR: #3333ff">Best--Michael Oritt
</DIV></DIV>
<DIV class=gmail_extra>
<DIV> </DIV>
<DIV class=gmail_quote>On Sun, Oct 22, 2017 at 11:01 PM, <SPAN dir=ltr><<A
target=_blank>s.hutchings@rogers.com</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex">I
had an old Austin 1800 with positive ground- I just isolated the negative
ground radio from the chassis and ran it as negative ground. It depends on
the radio design whether you have enough room to sheath it in something like
very thin plywood.<BR><BR>Stephen BJ8<BR><BR>Sent from my iPad<BR><BR>>
On Oct 22, 2017, at 1:38 PM, <<A>glemon@neb.rr.com</A>>
<<A>glemon@neb.rr.com</A>> wrote:<BR>><BR>> I used a polarity
converter many years ago when I put a "modern" am fm cassette in my 67
Sprite (Pioneer KP5500, the things you remember). The inverter ran all
the time and made a high pitched slightly audible squeal. After it
drained my battery I added an inline switch. It also would cut out for
a second if there were a sudden voltage change, such as tapping the brake
lights.<BR>><BR>> I messed around with the voltage regulator to try to
compensate for the voltage drop, no help, screwed that up
too.<BR>><BR>> An all (many) subsequent cars I just switched polarity,
much easier and never any problems.<BR>><BR>> Greg
Lemon<BR>><BR>> ---- Oudesluys <<A>coudesluijs@chello.nl</A>>
wrote:<BR>>> There are also separate radio polarity converters
around.<BR>>> Kees Oudesluijs<BR>>><BR>>><BR>>> Op
21-10-2017 om 10:57 schreef Bob Simmen:<BR>>>><BR>>>> Is
there a way to change an original positive ground radio to
negative<BR>>>> ground on my BJ8?<BR>>>><BR>>>>
Thanks in advance.<BR>>>><BR>>>>
Bob<BR>>>><BR>>>><BR>>>><BR>>>>
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