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Message: <blockquote data-quote="zane" data-source="post: 85056" data-attributes="member: 540617">Hrmm..  politely kick your self in the shennanigan.    Automotive Electronics have everything to do with what this discussion entails.   If you do not care about what is common knowledge and instruction in the automotive world then continuing this discussion is pointless, as you will not be able to grasp anything from here on out.  However, if you still would like to insist that my ASE manuals for Advanced Automotive Electronics, and Mitchel Repair Manuals are just a bunch of BS; I guess you had better get busy informing all the mechanics across the globe, that what they have learned is all wrong.I was unclear in my previous post.  Sorry for the confusion.The cap would be a load only when its voltage falls below 14.4 volts. (Car at idle)However, as a cap only contains enough reserve for a second or two, it is useless after that, and becomes a load on the charging system more often than not.You can referecnce this tech article on rec.audio.car"Although a battery may be able to respond in tenths of a second, bass notes are often much shorter and need current immediately -- which capacitors can supply. The difference between the two is that while the capacitor can supply a large amount of current immediately, their voltage quickly drops making them ineffective "<a href="http://www.mobileaudio.com/rac-faq/rac-faq_2.html#SEC23" target="_blank">http://www.mobileaudio.com/rac-faq/rac-faq_2.html#SEC23</a>Or from <a href="http://www.eatel.net/~amptech/elecdisc/capacitr.htm" target="_blank">http://www.eatel.net/~amptech/elecdisc/capacitr.htm</a>"Keep in mind that the discharge is only for a fraction of a second. The capacitor can not act like a battery. It only serves to fill in what would otherwise be very small dips in the supply voltage. "see above- this has also been clarified.They do work together.   In simplest terms, Each is the sole power supply while the car is not running or running respectively.Yes, while the vehicle is running, the battery is a load.   It is not a load when the vehicle is not running.All components of the charging system work together.  This is common auotmotive knowledge.....Refer to above- I have clarified myself on this matter.So all mechanics are wrong now?Blah- Mabey you need to take a look into some automotve tech books, as this issue does pertain to automotive electronics.I agree- caps have been arround for a long time and are extensively used, however, thier purpose is never to supplement a weak power supply.I fully understand how caps work thank you.  Mabey its time you do some research into applied automotive electronics.I believe RC put it best:Perry Babin also:You can reference that right from his site:<a href="http://www.eatel.net/~amptech/elecdisc/capacitr.htm" target="_blank">http://www.eatel.net/~amptech/elecdisc/capacitr.htm</a> I can see this holding true for batteries, however, with alternators- no.An alternator consistantly supplies power while the engine is running, meaning that there is always power available.There are some alternator Voltage regulators that will not react as quickly as most do today-however, I would certainly not classify a fraction of a second as slow.   So long as there is sufficient power to begin with, this should not be an issue.Only when you require more than the charging system was designed for will you notice any "lack of response."   This is because the alternator can not keep up with the power demands.   Adding a cap that will "alleviate" this strain for a matter of a second or two will still not solve the problem.   Once the cap is out, it too has to wait for the alternator to respond.   Makes caps pretty useless, that is - unless you have a whole truckload of them behind you to make sure that the alternator does not get over burdened.With this in mind- why bother with a cap when the problem can be taken care of at the source?</blockquote>

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