XPost: alt.home.repair, sci.electronics.repair   
   From: rod.speed.aaa@gmail.com   
      
   On Thu, 19 Jan 2023 02:41:48 +1100, Mighty✅ Wannabe✅ <.> wrote:   
      
   > Peter wrote on 1/18/2023 10:16 AM:   
   >> MightyWannabe wrote:   
   >>   
   >>> There is a good possibility the rectifiers (diodes) in your alternator   
   >>> could fry because it is recommended that your car be running when you   
   >>> jump start another car. The rectifiers of your car is supplying   
   >>> electric   
   >>> current from the alternator and can overload due to the jump start   
   >>> operation.   
   >> In the recipient car, when the engine finally starts, I was told since I   
   >> was young that the best way to "absorb" some of the excess current in   
   >> the   
   >> first few seconds is for the recipient to turn on the headlights.   
   >>   
   >> This seems counterintuitive from the recipient's standpoint in terms of   
   >> "using" current but the theory is that the "B" sense circuit of the   
   >> alternator (which is just a coil of wire in the end) senses a "very low"   
   >> battery so it tells the alternator to put out a "very high" current,   
   >> whose   
   >> initial burst could ("they say") fry the rectifying wheatstone diodes.   
   >>   
   >> Maybe it makes sense to the electronics folks who are asked to comment.   
   >>   
   >>> There is also the possibility of the voltage drop so low momentarily   
   >>> that your car stereo's anti-theft system kicks in, and you'll have to   
   >>> go   
   >>> back to the car dealership to enter the anti-theft code. The anti-theft   
   >>> system detects the zero voltage when it is ripped from the dashboard.   
   >> But what happens each time you replace the battery every few years?   
   >   
   >   
   > I can think of a simple way. Connect jump cable clamps to the car   
   > battery terminals and then carefully loosen and lift the terminals from   
   > the old battery.   
      
   Trouble with that approach is that you can't   
   usually connect the thick battery leads to the   
   new battery until the new batter is where the   
   old battery still is.   
      
   > Another way is to connect a 12V cigarette lighter plug into the   
   > cigarette lighter socket to temporarily maintain a 12V to the whole   
   > system from another 12V power source before you disconnect your old   
   > battery. You may have to power on the accessories in your car if you car   
   > is designed to cut off the power to the cigarette lighter socket when   
   > the ignition is off.   
   >   
   >   
   >   
      
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