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Old 06-06-2019, 04:58 AM
tistanle tistanle is offline
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Default failing alternators

I have an 06 dodge Dakota. In the last 6 months I have replace the alternator 3 times. I replaced one the first of December that lasted about 2 weeks. The second one lasted from December to the end of May. I just replaced it again just a week ago. Itis now making a high pitch whining noise. My question. What would be causing the alternators to fail?
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Old 06-06-2019, 08:23 PM
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Have you had the battery tested by a qualified shop? The testers used at car parts places are not considered a 'qualified shop' IMHO. One bad alternator maybe, but two is very suspect. If the alternator has to work overtime because of a weak or failing battery, it will wear out very quickly. The shop will also check the charging voltage. Anything over about 14 volts except right after startup may indicate that the PCM is asking the alternator for too much.
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Old 06-08-2019, 01:38 PM
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Since it's making noise it sounds like a mechanical issue to me. If the alternator isn't in the correct position with the pulley aligned right it can put stress on the bearings. I had one onetime that the mounting bracket was bent and cocked on a very slight angle and was wearing out alternators.
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Old 06-15-2019, 04:44 PM
Cobradoc Cobradoc is offline
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Quote:
Originally Posted by tistanle View Post
…. What would be causing the alternators to fail?
Over the years I've replaced several OEMs with after-market alternators and had them to fail shortly after installing them. I learned the hard way that all after-market alternators are not the same. Just because they are tagged for your truck doesn't mean squat. The highest failure parts in an alternator are the diodes. Rebuilt alternators are notorious for having the wrong (cheaper, smaller) diodes used to replace the dead ones.

There's a good chance that you are getting rebuilt alternators with a lower amperage output than your truck requires, consequently, they only last a couple weeks at best. Make sure you're getting the correct size alternator (amperage wise) for your truck. Good luck.
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Last edited by Cobradoc; 06-15-2019 at 04:46 PM.
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