Hasse
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| posted on 18/3/05 at 07:36 AM |
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Splitrivet: What do you mean with ac application as alternator lamp?
I cant see any ac applications at all in a car, except for inside the alternator, before the main diods.
/Hasse
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NS Dev
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| posted on 18/3/05 at 09:03 AM |
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quote:
Originally posted by Hasse
Sufficient current from the charging lamp is "the sure way" to start the charging. Without this current, it may start from remaining
remanens in the iron, but is not given at all, that the the charging will start.
Maybe it will also depend on how long the alternator has been "resting" since last used? Every day use could then maybe be positive to
achieve charging.
/Hasse
You might be right there Hasse, the car was in daily use as a road car.
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splitrivet
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| posted on 18/3/05 at 10:04 AM |
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OK hasse bad choice of words, should have said current can flow either way.
But as LED's are used the same way in AC circuit thought this was the best way of explanation.
Cheers
Bob
[Edited on 18/3/05 by splitrivet]
[Edited on 18/3/05 by splitrivet]
I used to be a Werewolf but I'm alright nowwoooooooooooooo
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clbarclay
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| posted on 18/3/05 at 11:28 AM |
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As I understand it the alternator lamp either has current flowing from battery to alternator (when alternator is not working), or when the alternator
is working the volatge is equal either side of the bulb, therefore ther is no potential difference across the buld and no current flows. hence the
buld goes out.
As I understand it current will only flow one way through the buld, its the nature of the circuit its in.
[Edited on 18/3/05 by clbarclay]
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splitrivet
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| posted on 18/3/05 at 12:51 PM |
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The current thru the lamp can flow the other way ie when the battery voltage is lower than the alternator a duff battery lets say will show itself by
as you increase revs your warning lamp gets brighter (more current flowing backwards to the battery) if the reverse happens its your alternator.
Cheers,
Bob
I used to be a Werewolf but I'm alright nowwoooooooooooooo
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clbarclay
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| posted on 18/3/05 at 02:09 PM |
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The main output from the alteranator goes to the battery + terminal?
If so then should not the alternator is increase the voltage on the battery side of the buld as well, 'equal' to the output of the wire
straight to the buld?
I've driven some vehicles with pritty duff batteries and haven't noticed the bulb iluminate whalst the alterantor is working.
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splitrivet
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| posted on 18/3/05 at 05:17 PM |
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To be honest I dont know if this is the case with a self exciting alternator,in which case only the battery lead is required to supply the field
voltage which is probably why NS Devs motor worked without a warning lamp either that or the diodes in the alternator were very leaky.
Cheers,
Bob
I used to be a Werewolf but I'm alright nowwoooooooooooooo
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clbarclay
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| posted on 18/3/05 at 07:49 PM |
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Is the attached wireing diagram for an alternator, it however is my understanding.
Is the diagram correct, over simplified or plain wrong for a typical alternator charging setup.
 
Rescued attachment alternator wireing.JPG
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splitrivet
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| posted on 18/3/05 at 09:44 PM |
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Found this site tells you all you need to know.
http://www.alternatorparts.com/understanding_alternators.htm
Actually is a pretty shite hot site with loads of info,got nowt to do with LED's though
Cheers,
Bob
[Edited on 18/3/05 by splitrivet]
I used to be a Werewolf but I'm alright nowwoooooooooooooo
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kaymar
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| posted on 20/3/05 at 12:05 AM |
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oh dear! as i understand it 12v from battery flows through red warning/charge bulb to "ind" wire of alternator to earth when alternator
stationary, when spinning the alternator is initially excited by thie ind supply and begins to generate, at which point the battery is then charged.
if battery voltage initially was 12.2 alt output zero untill operating, once alt is spinning/operating its output being 13.4v this measurement will
be the same as ind equal so battery/charge light goes out. some not all alternators will self excite to charge under heavy throttle but this is notr
recomended as the norm. to be honest!!!!! whats really wrong with normal bulbs?
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