The most likely situation is that you disconnect it for some reason (replacing the starter when the cable goes to one of the bolts that hold it, etc.) and then forget to hook it up. Or, in an older vehicle, corrosion where the wire meets the lug.
Vic 4X6GP > On 27 Jun 2017, at 22:42, Charlie T, K3ICH <[email protected]> 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 >>> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Message > delivered to [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
