alternator problem?

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CarGuru > Ford > alternator problem? 21 April 2005 01:35:14

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alternator problem?
Selah 11 April 2005 12:50:13
	We have a 94 ford explorer. The ammeter says it's charging when we drive on the highway. But when we drive in stop and go traffic the needle goes down. Eventually the battery goes dead if we keep driving in the city. Would appreciate any help with this. THanks.
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Big Bill 11 April 2005 20:36:31 [ permanent link ]
	On 11 Apr 2005 08:50:13 GMT, selah <pzion.naaxx@yahoo.com> wrote: We have a 94 ford explorer. The ammeter says it's charging>when we drive on the highway. But when we drive in stop and>go traffic the needle goes down. Eventually the battery goes>dead if we keep driving in the city.> Would appreciate any help with this.> THanks. Have the alternator checked; it sounds likek the rectifier bridge (the diodes) is not working right. -- Bill Funk Change "g" to "a"
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Selah 15 April 2005 12:35:52 [ permanent link ]
	Thanks. I've noticed that the ammeter goes down each time the rpm goes below around 650 and then goes up again when the rpm is above 700. Is there a way to set the idle speed - or should it not make a difference? In article <fr9l51duq8poksuvd9ciqiiok4776ak9lt@4ax.com>, Big Bill wrote:> On 11 Apr 2005 08:50:13 GMT, selah <pzion.naaxx@yahoo.com> wrote:> We have a 94 ford explorer. The ammeter says it's charging>>when we drive on the highway. But when we drive in stop and>>go traffic the needle goes down. Eventually the battery goes>>dead if we keep driving in the city.>> Would appreciate any help with this.>> THanks.> Have the alternator checked; it sounds likek the rectifier bridge (the> diodes) is not working right.>
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Big Bill 15 April 2005 19:56:12 [ permanent link ]
	On 15 Apr 2005 08:35:52 GMT, selah <pzion.naaxx@yahoo.com> wrote: Thanks.> I've noticed that the ammeter goes down each time the rpm goes below>around 650 and then goes up again when the rpm is above 700. Is there>a way to set the idle speed - or should it not make a difference? Going from memory, 650 isn't very low for idle. I'm not sure how to set the idle speed, either. Maybe Jim will help. Have you had the alternator checked?> In article <fr9l51duq8poksuvd9ciqiiok4776ak9lt@4ax.com>, Big Bill wrote:>> On 11 Apr 2005 08:50:13 GMT, selah <pzion.naaxx@yahoo.com> wrote:>> We have a 94 ford explorer. The ammeter says it's charging>>>when we drive on the highway. But when we drive in stop and>>>go traffic the needle goes down. Eventually the battery goes>>>dead if we keep driving in the city.>>> Would appreciate any help with this.>>> THanks.>> Have the alternator checked; it sounds likek the rectifier bridge (the>> diodes) is not working right.>> -- Bill Funk Change "g" to "a"
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Alternatorman 21 April 2005 01:35:14 [ permanent link ]
	"Big Bill" wrote: > On 15 Apr 2005 08:35:52 GMT, selah <pzion.naaxx@yahoo.com> > wrote: > Thanks. > > I've noticed that the ammeter goes down each time the rpm > goes below > >around 650 and then goes up again when the rpm is above 700. > Is there > >a way to set the idle speed - or should it not make a > difference? > Going from memory, 650 isn't very low for idle. > I'm not sure how to set the idle speed, either. Maybe Jim will > help. > Have you had the alternator checked? > > In article <fr9l51duq8poksuvd9ciqiiok4776ak9lt@4ax.com>, Big Bill wrote: >  >> On 11 Apr 2005 08:50:13 GMT, selah > <pzion.naaxx@yahoo.com> wrote: >  >> >   >>>We have a 94 ford explorer. The ammeter says > it's charging >   >>>when we drive on the highway. But when we drive > in stop and >   >>>go traffic the needle goes down. Eventually the > battery goes >   >>>dead if we keep driving in the city. >   >>> >   >>>Would appreciate any help with this. >   >>> >   >>>THanks. >  >> >  >> Have the alternator checked; it sounds likek the > rectifier bridge (the >  >> diodes) is not working right. >  >> > -- > Bill Funk > Change "g" to "a" You don’t say by how much the ammeter reading goes down. But this sounds normal to me. Every alternator made gives less output at lower speeds. Every alternator made has a steep curve in the engine idle speed range. So an alternator rated at 120A for example, only gives 120A at high speed, around 6000 alternator RPM (maybe 2000 engine RPM). This same alternator might give a max of 50A at 1600 Alt RPM and 70A at 1800RPM. The engine idle speed probably falls between these two values. The lower alternator output at lower speeds is completely normal, and not a quality problem. It is part of the physics of any alternator. So if you say 1) the alternator was checked and is OK, and 2) highway speeds are no problem, but city driving is a problem, then I suspect the most likely case is that you have added some aftermarket electrical components which are drawing too much current at low speed, and draining the battery. (Average engine speed in City driving is much lower, more idling) Did you add anything, like a subwoofer, new electric radiator fan, refrigerator, etc ? -- Posted using the http://www.autoforumz.com interface, at author's request Articles individually checked for conformance to usenet standards Topic URL: http://www.autoforumz.com/Ford-Explorer-alternator-problem-ftopict111683.html Visit Topic URL to contact author (reg. req'd). Report abuse: http://www.autoforumz.com/eform.php?p=532047
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CarGuru > Ford > alternator problem? 21 April 2005 01:35:14

	see also: Re: 2007 Crv opinion Re: 97 Honda CX 40 mpg but burning…		pass tests:		see also: 4e za dephizit zapisei 1996 Acura Integra 91 lumina trans axel locked

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alternator problem?

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