Jeep alternator

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Jeep alternator
Smitty 2 March 2005 08:22:56
	I took my 96 grand Cherokee in for a water pump replacement. The shop said that I also had a bad alternator. It worked fine in our -20 temps here in MN and the warning light has never come on. Do you think it could be bad? Thanks Smitty
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Thor 2 March 2005 18:32:31 [ permanent link ]
	If your battery has not gone dead I would not replace it. "Smitty" <smitty56401@charter.net> wrote in message news:qkbVd.2331$vi5.1984@fe07.lga... : I took my 96 grand Cherokee in for a water pump replacement. The shop : said that I also had a bad alternator. It worked fine in our -20 temps : here in MN and the warning light has never come on. Do you think it : could be bad? : Thanks : Smitty
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Tnkev 2 March 2005 18:49:19 [ permanent link ]
	"THOR" <thor5@usfamily.net> wrote in message news:58kVd.4$Ey6.572@news.uswest.net...> If your battery has not gone dead I would not replace it.> "Smitty" <smitty56401@charter.net> wrote in message> news:qkbVd.2331$vi5.1984@fe07.lga...> : I took my 96 grand Cherokee in for a water pump replacement. The shop> : said that I also had a bad alternator. It worked fine in our -20 temps> : here in MN and the warning light has never come on. Do you think it> : could be bad?> : Thanks> : Smitty> I would ask them to show you the test of your alternator in other words make them load test it in front of you if won't show you go some where else.
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Sharon K.Cooke 2 March 2005 19:42:56 [ permanent link ]
	Install a voltmeter gauge and watch it yourself. If it shows >13.5 volts at idle and >14 volts on the highway, the alternator's fine. TNKEV wrote:> "THOR" <thor5@usfamily.net> wrote in message> news:58kVd.4$Ey6.572@news.uswest.net...> > If your battery has not gone dead I would not replace it.> > "Smitty" <smitty56401@charter.net> wrote in message> > news:qkbVd.2331$vi5.1984@fe07.lga...> > : I took my 96 grand Cherokee in for a water pump replacement. The shop> > : said that I also had a bad alternator. It worked fine in our -20 temps> > : here in MN and the warning light has never come on. Do you think it> > : could be bad?> > : Thanks> > : Smitty> > I would ask them to show you the test of your alternator in other words make> them load test it in front of you if won't show you go some where else.
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Smitty 2 March 2005 22:01:48 [ permanent link ]
	thanks I just now did that. The load test showed 11v and the "new" one did too. I'm thinking that there is some external regulator that needs to be in the circuit. Very strange. I don't know what to think now. Smitty "TNKEV" <kthune@alexanderjeepfrankling.com> wrote in message news:d04jv4$72d$1@domitilla.aioe.org...> "THOR" <thor5@usfamily.net> wrote in message> news:58kVd.4$Ey6.572@news.uswest.net...>> If your battery has not gone dead I would not replace it.>> "Smitty" <smitty56401@charter.net> wrote in message>> news:qkbVd.2331$vi5.1984@fe07.lga...>> : I took my 96 grand Cherokee in for a water pump replacement. The shop>> : said that I also had a bad alternator. It worked fine in our -20 temps>> : here in MN and the warning light has never come on. Do you think it>> : could be bad?>> : Thanks>> : Smitty>> I would ask them to show you the test of your alternator in other words > make> them load test it in front of you if won't show you go some where else.>
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Daniel J. Stern 3 March 2005 00:10:38 [ permanent link ]
	On Tue, 1 Mar 2005, Smitty wrote: I took my 96 grand Cherokee in for a water pump replacement. The shop> said that I also had a bad alternator. It worked fine in our -20 temps> here in MN and the warning light has never come on. Do you think it> could be bad? Certainly. The mechanic probably gave it a spin after having removed the belt to change the water pump, and detected a rough bearing, indicating impending alternator lockup. Such an alternator usually charges just fine right up to the instant it locks up and causes big problems. DS
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Daniel J. Stern 3 March 2005 07:47:40 [ permanent link ]
	On Wed, 2 Mar 2005, Bill Putney wrote: ask him to be more specific about what's gone bad in the alternator.> > I'm betting he gave the alternator a spin when he removed the belt to> > replace the water pump, and felt a rough bearing. Smitty posted a little earlier that both old and new alternators load> tested at 11V - so it sounds like something else is going on external to> the alternator. 1) The load test results say nothing about the condition of the bearings. 2) It's entirely possible the load test was not done correctly. The dust being thrown from the serpentine belt downstream of the alt.> pulley piled into a handy little crevice on top of the engine. When I> opened the hood, the pile of rubber dust was glowing red, just like> embers in a fireplace. Really weird and amazing. Fun and amazing after the fact...scary and damned inconvenient at the time!
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Bill Putney 3 March 2005 15:23:58 [ permanent link ]
	Daniel J. Stern wrote:> On Wed, 2 Mar 2005, Bill Putney wrote:> ask him to be more specific about what's gone bad in the alternator.>>>I'm betting he gave the alternator a spin when he removed the belt to>>>replace the water pump, and felt a rough bearing.> Smitty posted a little earlier that both old and new alternators load>>tested at 11V - so it sounds like something else is going on external to>>the alternator.> 1) The load test results say nothing about the condition of the bearings.> 2) It's entirely possible the load test was not done correctly. But...if the load test is correct, then there's no reason to assume it's the bearings. But we're both speculating about something we can't prove. Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my adddress with the letter 'x')
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Mike Romain 3 March 2005 18:27:35 [ permanent link ]
	That sounds like they noticed something physical like a worn bearing. One test is to start it up and feel the alternator. When bearings are about to fail, they usually heat up the alternator case fast and they usually cause a vibration you can feel. Another test is to remove the fan belts and hand rotate the alternator to feel for bearing grab or play in the shaft. If there is any shaft play, suspect a bearing. Then you have your common, 'he is getting off too cheap with a belt, lets see what else we can sucker him for' ploy. This seems to be happening more and more these days as cars get more complicated. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's "Daniel J. Stern" wrote:> On Tue, 1 Mar 2005, Smitty wrote:> I took my 96 grand Cherokee in for a water pump replacement. The shop> > said that I also had a bad alternator. It worked fine in our -20 temps> > here in MN and the warning light has never come on. Do you think it> > could be bad?> <snip novel>
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Daniel J. Stern 3 March 2005 19:16:43 [ permanent link ]
	On Thu, 3 Mar 2005, Bill Putney wrote: Smitty posted a little earlier that both old and new alternators load> >>tested at 11V - so it sounds like something else is going on external to> >>the alternator. The load test results say nothing about the condition of the bearings. But...if the load test is correct, then there's no reason to assume it's> the bearings. Sure there is: The tech said the alternator is going bad.
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Smitty 4 March 2005 03:01:30 [ permanent link ]
	Thanks for all your replies. The tech said nothing about the bearings. I watched him do the load test. Both the new one and the old one had the same output of 11V. I'm thinking that this unit has a voltage regulator that is separate from the alternator itself and there is some thing inside the alternator that keeps it from going too high with out the external regulator. On the vehicle the output tested low also, although I did not see him test it. I left the shop (not a Chrysler shop) with these words. If you think the new one will work put it on. He said he would and that he would check it after it was installed. If it did not work he said that he would put the old one back on. My wife picked up the car with a new alternator. I have not had a chance to check it myself for output but I will this weekend. The whole thing is still a little of a mystery but thanks to everyone who replied. My wife just drove in with the car while I was typing this. I just checked it out with the new alternator installed. Engine off- the battery measures 12.4V Running it checks 13.9V so I guess all is well. I may never know if it really needed a new alternator but I'll have to take their word for it. They have always done the right thing in the past so I guess It's a done deal. Thanks again, Smitty "Daniel J. Stern" <dastern@127.0.0.1> wrote in message newsine.GSO.4.58.0503031016090.11189@alumni.engin.umich.edu...> On Thu, 3 Mar 2005, Bill Putney wrote:> Smitty posted a little earlier that both old and new alternators load>> >>tested at 11V - so it sounds like something else is going on external >> >>to>> >>the alternator.> The load test results say nothing about the condition of the bearings.> But...if the load test is correct, then there's no reason to assume it's>> the bearings.> Sure there is: The tech said the alternator is going bad.
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Bill Putney 4 March 2005 03:12:33 [ permanent link ]
	Daniel J. Stern wrote:> On Thu, 3 Mar 2005, Bill Putney wrote:> Smitty posted a little earlier that both old and new alternators load>>>>tested at 11V - so it sounds like something else is going on external to>>>>the alternator.> The load test results say nothing about the condition of the bearings.> But...if the load test is correct, then there's no reason to assume it's>>the bearings.> Sure there is: The tech said the alternator is going bad. No - the OP said: "The shop said that I also had a bad alternator" (check the original post) as in "already bad". That doesn't imply bad bearings any more than bad electrical output. Not quite the same as the shop saying it was "going bad". Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my adddress with the letter 'x')
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Mike Romain 4 March 2005 04:51:56 [ permanent link ]
	Well.... The regulator is in the computer, not the alternator shell but still...... I really have a hard time buying a 'dead' alternator suddenly when you get a belt changed, especially after all the recent cold weather and you having no issues..... Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Smitty wrote:> Thanks for all your replies. The tech said nothing about the bearings. I> watched him do the load test. Both the new one and the old one had the same> output of 11V. I'm thinking that this unit has a voltage regulator that is> separate from the alternator itself and there is some thing inside the> alternator that keeps it from going too high with out the external> regulator. On the vehicle the output tested low also, although I did not> see him test it. I left the shop (not a Chrysler shop) with these words. If> you think the new one will work put it on. He said he would and that he> would check it after it was installed. If it did not work he said that he> would put the old one back on. My wife picked up the car with a new> alternator. I have not had a chance to check it myself for output but I will> this weekend. The whole thing is still a little of a mystery but thanks to> everyone who replied.> My wife just drove in with the car while I was typing this. I just checked> it out with the new alternator installed. Engine off- the battery measures> 12.4V Running it checks 13.9V so I guess all is well. I may never know if> it really needed a new alternator but I'll have to take their word for it.> They have always done the right thing in the past so I guess It's a done> deal.> Thanks again,> Smitty> "Daniel J. Stern" <dastern@127.0.0.1> wrote in message> newsine.GSO.4.58.0503031016090.11189@alumni.engin.umich.edu...> > On Thu, 3 Mar 2005, Bill Putney wrote:> > Smitty posted a little earlier that both old and new alternators load> >> >>tested at 11V - so it sounds like something else is going on external> >> >>to> >> >>the alternator.> > The load test results say nothing about the condition of the bearings.> > But...if the load test is correct, then there's no reason to assume it's> >> the bearings.> > Sure there is: The tech said the alternator is going bad.
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Mic Canic 4 March 2005 05:53:15 [ permanent link ]
	they might have found with the belt off the alt. pulley is noisey like it has a bad bearing TNKEV wrote: "THOR" <thor5@usfamily.net> wrote in message> news:58kVd.4$Ey6.572@news.uswest.net...> > If your battery has not gone dead I would not replace it.> > "Smitty" <smitty56401@charter.net> wrote in message> > news:qkbVd.2331$vi5.1984@fe07.lga...> > : I took my 96 grand Cherokee in for a water pump replacement. The shop> > : said that I also had a bad alternator. It worked fine in our -20 temps> > : here in MN and the warning light has never come on. Do you think it> > : could be bad?> > : Thanks> > : Smitty> > I would ask them to show you the test of your alternator in other words make> them load test it in front of you if won't show you go some where else.
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Steve 5 March 2005 01:29:00 [ permanent link ]
	I'm curious Dan. Since the alternator was cooked, was there any core>>trade-in value on it towards the new one?> See the other thread about someone getting a "rebuilt" master cylinder with a notch broken out of the gasket sealing surface.... That should tell you how closely "cores" get inspected. Wouldnt surprise me if some of the trashed parts from Dans alternator made it into "rebuilt" parts and were sold.
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Jeep alternator

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