[aprssig] 12V wiring ideas

KBØNLY kb0nly at mchsi.com
Sat Oct 29 22:47:35 CDT 2011

That would only have made the radio a return path if it was grounded to the 
body/frame through its mounting bracket/antenna shield and it would have 
also had to be grounded directly to the battery but you said it was to the 



-----Original Message----- 
From: Curt, WE7U
Sent: Saturday, October 29, 2011 8:04 PM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] 12V wiring ideas

On Sat, 29 Oct 2011, KBØNLY wrote:

> That’s what I was just going to say, couldn't have happened as described 
> with
> a negative ground.
> Scott
> -----Original Message----- From: DALE
> Sent: Saturday, October 29, 2011 7:13 PM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] 12V wiring ideas
> in that case there was a piece of pos gnd equipment installed.
> dale

I don't believe that was the case, but that was a long time ago.  I believe 
the 1st car was either a Plymouth Fury I or a Ford Pinto Station Wagon 
(probably the latter).  The 2nd car was a Plymouth Fury III.  These cars 
were stock.

What I thought I figured out a few years later was that there must have been 
a loose ground (From the engine to the chassis?  Chassis to battery?), so 
the starter current tried to return via a different path.  Could there have 
been potential between the antenna ground and the metal dash?  That would 
have caused current to flow through the radio's ground.

Curt, WE7U.        http://www.eskimo.com/~archer
APRS Wiki:  http://info.aprs.net/

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