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noisy bearings would be the most readily observable sign that an alternator is failing. A noisy bearing will translate into extra heat, which will cause the diodes to fail.
Beyond that, look for low output (dimming lights) or perhaps excessive static through the radio. Some static can be caused by other sources, so you'll need to have the charging system checked to be sure, and if the lights only dim a little while the engine is at an idle, it may be more of a battery issue than a failing alternator.
Diodes can fail at any time, making an alternator useless, but they don't generally give much warning. Brushes can wear, and they too don't generally offer much warning. Windings can fail, but that is generally the result of some other problem, and the solid state regulator is just like any other transistorized device; it can fail from heat or just plain age, but it doesn't give a warning either.
Other than their size and the way they mount to the vehicle, alternators are pretty much the same for all vehicles.
Always test parts thoroughly before just replacing something.
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Where is the starter located on a 2001 Saturn SL1?
The starter on a 2001 Saturn SL1 is located on the driver's side of the engine. It is just to the left and in front of the alternator/generator.
How do you change the alternator on a 2001 Saturn sl2?
http://youtube.com/watch?v=ngcEWopvPBY
Where is the oil filter located on a 2001 Saturn SL1?
Check behind the engine underneath, usually towards the right hand side. Below the alternator.
Ahow do you put an alternator belt on a Saturn 2001 l-300?
u have to remove the air filter box and the engine mount to replace the belt....
How do you change the alternator on a 2001 Ford Focus?
how do i change the alternator in my 2001 ford focus?
How many hours to put on an alternator on a 2001 Saturn sl?
if it takes you more than 2 and that's if your drinkin beer you don't belong anywhere near a wrench
Does the 2001 VW Beetle have a generator or an alternator?
has an alternator
Where is the voltage regulator on the 2001 Saturn SC2?
The voltage regulator on alternators of almost all modern vehicles (including all Saturn's), is INSIDE the alternator. When rebuilding an alternator it is relatively simple to replace the regulator at the same time you replace brushes, bearings and other components, but if you haven't done it before and don't have someone knowledgeable to guide you through the process, don't try to rebuild an alternator yourself.
What are the Timing marks for a 2001 Saturn 1.9?
There is no external timing marks on 2001 Saturn.
How do you remove alternator on 2001 Chrysler lhs?
please send me instructions on how to remove alternator on Chrysler 2001 lhs?
How do you route the Alternator and AC belt on a 2001 Mitsubishi eclipse?
how do you route the alternator and ac belt on a 2001 Mitsubishi eclipse
Torque specs for 2001 Saturn?
What is the torque spec for a 2001 Saturn head? It has only a single cam
