I once had the connection to the battery on my old VW bug fail due to
corrosion around the battery contacts. I don't remember if it was the
positive or negative lead.
I believe modern autos often have a current sensor in the negative
battery lead. So you are supposed to connect the radio negative lead to
the chassis side of the sensor. And if you connect it to any part of
the negative battery lead you should fuse it in case the battery chassis
connection goes bad for any reason.
Alan N1AL
On 06/27/2017 12:42 PM, Charlie T, K3ICH wrote:
I have to ask, has ANYONE ever heard of a circumstance where the negative
return lead from the battery to the engine block has ever failed, short of a
battlefield situation?
Still, probably a good idea to fuse the negative to radio wire anyway.
Charlie k3ICH
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Vic Rosenthal
Sent: Tuesday, June 27, 2017 11:52 AM
To: Clay Autery <[email protected]>
Cc: [email protected]
Subject: Re: [Elecraft] OT: 2017 Chevy Silverado 1500 power outlets
I don't think math or difficult physics is needed. Suppose you connect the
radio directly to battery, and then suppose the battery to ground cable
becomes partially or completely disconnected. Finally, suppose you then try
to start the engine. When the starter solenoid closes, some of the high
current from the battery negative terminal flows through the negative lead
to the radio, and then to ground through the radio's mounting bracket, the
coax to the antenna, etc. The no. 10 ground wire might have to carry several
hundred amps! Lots of things can be damaged.
This is why negative leads should be fused, at least.
Vic 4X6GP
On 27 Jun 2017, at 18:21, Clay Autery <[email protected]> wrote:
Horse puckey! I DEFY you to prove the physics OR math of that
ridiculous statement.
______________________
Clay Autery, KY5G
On 6/27/2017 9:55 AM, [email protected] wrote:
WARNING!
For extremely important safety and fire prevention reasons reasons,
no accessory should ever be connected directly to the negative
terminal of an automotive battery . Just like when charging an
automotive battery, the negative lead of a cable running directly to
the battery should always connect to the engine block and never
directly to the battery.
The positive lead must be fused where it connects to the battery.
There's an excellent discussion here:
https://www.w8ji.com/negative_lead_to_battery.htm
73
Frank
W3LPL
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