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Old 09-10-2010, 08:56 PM   #1
RHirsh
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Alternator Problems 2005 ST/ZX4

About 6 weeks ago, the alternator light on the dashboard went on. Cursory voltage probing seemed to indicate no voltage coming out of the alternator. Took the car into the dealer, they replaced the alternator, and $650 later all was fine until this week.

Alternator light came back on this Tuesday while idling at a light, but went off a minute later. This (Friday) evening it came on again when in idle, went off when I upped the RPMs, but then came on for keeps in less than a minute.

I replaced the battery about a week before the dealer replaced the alternator - local Tires Plus mechanic thought it was marginal. Thought the battery might really be the culprit here, but then why the month without any issues?

If anyone has had similar problems, or some thoughts, I'd be grateful. Will check BJB fuse 10 and voltages tomorrow morning (a multimeter is about the only tool I've got in my home), then will unhappily take it back to the local dealer.


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Old 09-10-2010, 10:23 PM   #2
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If it's under warranty, take it back to the dealer. If not, remove alternator, and take it to a local rebuilder. It shouldn't cost much, and should come with a warranty. Most likely the problem is an inferior (cheaper) voltage regulator being used.
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Old 09-12-2010, 02:50 AM   #3
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Posted via FF Mobile Yup, and dealer work comes with a warranty, that`s why you paid them to do it, right? Electrical parts can be like light bulbs (all of THEM are "cheap" as whynot mentioned alternator parts can be) and you know they can be bad immediately or last a long time - no way to tell without testing..... Testing done, time for a new one....
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Old 09-13-2010, 08:20 PM   #4
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Took it back to the dealer, and it was in fact a bad rebuild. I admit when I did the initial post I thought it was a new part ($350 after the $75 core trade in) which is why I was surprised: never had a bad new Ford part before. I hadn't replaced an alternator since one went bad on my 1973 Mach I some time ago, and that rebuild was more like $35. Guess the 30 year old number just stuck in my head.

Anyway, the alternator promptly failed pinpoint test B, so they replaced it. No charge for the repair or the loaner car I used over the weekend.

My thanks to both of you for the advise and reassuring words.
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Old 09-14-2010, 12:48 PM   #5
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Posted via FF Mobile Hey, bleep happens, glad it`s fixed now - and the price was right!
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