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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-18-2009, 07:21 PM   #1
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I have a 94 Bonneville i bought it two years ago and yesterday i replaced the alternator for the 4th time does anyone know why this keeps happening??

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Old 03-21-2009, 10:38 PM   #2
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Quote:
Originally Posted by bonneville94 View Post
I have a 94 Bonneville i bought it two years ago and yesterday i replaced the alternator for the 4th time does anyone know why this keeps happening??

This was moved from the Lounge to this location.
Where have you been buying them from?
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Old 04-10-2009, 11:44 PM   #3
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Sometimes when you replace an alternator, the battery is down; when you start up with the new alternator installed, it has to put out a very high current load for the first few minutes to recharge the battery. This can stress the alternator and lead to early failure later. The best technique is the charge the battery *before* the first start with the new alternator.

Some of the aftermarket shops have lifetime guarantees on alternators. Replacing one isn't very hard.

How many miles in the two years?

Have the charging system professionally checked--Sears will do it for about $10.

Also: a dying battery will cause your car to go through alternators more quickly, as they do not hold a charge, and thereby are constantly demanding charging current from the alternator. If the battery is weak, it should show up in the charging system test. If there is any doubt, change the battery.

I have gone through this several times; the only two batteries I have found that last well are the factory GM battery, and Sears DieHard. The top of the line DieHard is 1/3 the price of the GM battery... you decide. Their charging system check is also a fraction of the dealer price.

Another possibility: corroded terminals at the battery. They make for poor connections, thus lower charging voltage, and sort of simulate the conditions created by a weak battery. I pull into sears at least once per year, and have the charging system checked and the battery serviced and the terminals cleaned. Seems to help...
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Old 04-10-2009, 11:55 PM   #4
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I would agree to check the battery cables, both ends. Corroded cables are a some what common problem. Also test the battery cable. Here are some tests for you to try.

https://www.gmforum.com/t279494/

https://www.gmforum.com/t279492/
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