Alternator Issues
#1
Alternator Issues
Is it possible for an alternator to test bad on the car after it's been running for a while and then test good after it cools down and taken off the car? My battery/charge light came on so I had the battery tested and the guy said the diodes in the alternator were bad. Took it off to get a new one and had it tested again to be on the safe side and it tested good... WTF? Can anyone shed some light on this? Thanks.
#2
yes. although the diode going bad will also cause a drain when the car is off. this is why it is dumb to remove the alt to test it. just put a voltmeter on it and see what the reading is.
#3
Originally Posted by mad_7tist
yes. although the diode going bad will also cause a drain when the car is off. this is why it is dumb to remove the alt to test it. just put a voltmeter on it and see what the reading is.
#5
BOOOYAHHHH!
replace the altenator.... stop pulling your hair out.
If you replaced the battery and then battery ends up dying. And the altenator tested bad once. The next logical step is to replace the altenator. Its a 10 min job.
If you replaced the battery and then battery ends up dying. And the altenator tested bad once. The next logical step is to replace the altenator. Its a 10 min job.
#7
Bzzzzz
Join Date: Jul 2003
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Yes, I agree that you should replace the alternator. The reason it would have tested good when you took it off the car is because you had no load on it.
When it was in the car, you tested with the load it would normally sustain, and it was straining to keep up.
When it was in the car, you tested with the load it would normally sustain, and it was straining to keep up.
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rgordon1979
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