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.
== Alex in Maine
"The Blue Mainie," 1960 Austin Healey 3000 BT7
"Conkling," 1946 M.G. TC #1321
Former owner 1957 A-H 100-6, 1967 A-H BJ8,
1965 MG Midget ?(???)?
http://ai2q.org/
----- Original Message -----
From: Michael Oritt
To: Stephen Hutchings
Cc: Austin Healey
Sent: Monday, October 23, 2017 2:42 PM
Subject: Re: [Healeys] Radio,changing from positive ground to negative ground?
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.
Best--Michael Oritt
On Sun, Oct 22, 2017 at 11:01 PM, <s.hutchings at rogers.com> wrote:
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.
Stephen BJ8
Sent from my iPad
> On Oct 22, 2017, at 1:38 PM, <glemon at neb.rr.com> <glemon at
neb.rr.com> wrote:
>
> 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.
>
> I messed around with the voltage regulator to try to compensate for the
voltage drop, no help, screwed that up too.
>
> An all (many) subsequent cars I just switched polarity, much easier and
never any problems.
>
> Greg Lemon
>
> ---- Oudesluys <coudesluijs at chello.nl> wrote:
>> There are also separate radio polarity converters around.
>> Kees Oudesluijs
>>
>>
>> Op 21-10-2017 om 10:57 schreef Bob Simmen:
>>>
>>> Is there a way to change an original positive ground radio to negative
>>> ground on my BJ8?
>>>
>>> Thanks in advance.
>>>
>>> Bob
>>>
>>>
>>>
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