Alternator or battery
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Lead Driver
Joined: Jul 2003
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From: Wheatland, Mo
Alternator or battery
Normally this is a DUH fix and I wouldn't ask...but about a month ago, I noticed that my bettery light came on for a few seconds, went out, back on flickering a little then out again. Well my charge gauge shows good, although I don't put alot in the factory gauges...and it didn't happenagain until about 4 dyas later. Now here is the kicker...it happened in tha same place on the way to work. Well after the second round. Nothing for about 2 weeks...then it did it again..on the same stretch of road.
Alternator...battery....aliens?
Lights don't flicker, nothing seems dimmed everything else works fine. I had the alternator checked out and that showed fine...the batteries show a good charge and holding....Thoughts?
Alternator...battery....aliens?
Lights don't flicker, nothing seems dimmed everything else works fine. I had the alternator checked out and that showed fine...the batteries show a good charge and holding....Thoughts?
FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
I would bet that you have fried a few of the recitfying diodes in your alternator. The others are trying to do double work to make up for it, but cant pass as much current as your truck is demanding at that given instant. This is why you are getting a voltage drop and a battery light.
Your alternator is probably doing a slow death. I would pull it and toake it to your local Auto Zone for a freebie load test.
Your alternator is probably doing a slow death. I would pull it and toake it to your local Auto Zone for a freebie load test.
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Lead Driver
Joined: Jul 2003
Posts: 7,406
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From: Wheatland, Mo
Originally Posted by redford
I would bet that you have fried a few of the recitfying diodes in your alternator. The others are trying to do double work to make up for it, but cant pass as much current as your truck is demanding at that given instant. This is why you are getting a voltage drop and a battery light.
Your alternator is probably doing a slow death. I would pull it and toake it to your local Auto Zone for a freebie load test.
Your alternator is probably doing a slow death. I would pull it and toake it to your local Auto Zone for a freebie load test.
Posting Guru
Joined: Apr 2000
Posts: 1,345
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From: NorCal
Sounds like what I went through. Look at my post..
https://www.ford-trucks.com/forums/5...67x-codes.html
I haven't had one more problem after replacing my alternator.
https://www.ford-trucks.com/forums/5...67x-codes.html
I haven't had one more problem after replacing my alternator.
Senior User
Joined: Mar 2006
Posts: 347
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From: Boca Raton, Florida
If you have around 150K on it it could be the brushes are getting short and not pressing on the comutator as hard as a full brush and that would make the light go on and off. Bad Diodes would most probably make light stay on steady. I see an alternator in your future.
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Junior User
Joined: May 2004
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From: N.H.
I am having the same issue and have 42,000 miles. It started this week. Well I hope it is only 1 of 2 alternators!
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From: NorCal
Originally Posted by rocknmud
I am having the same issue and have 42,000 miles. It started this week. Well I hope it is only 1 of 2 alternators!
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Joined: Sep 2000
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From: Stephensville WI
Originally Posted by SFeintuch
.... Bad Diodes would most probably make light stay on steady. I see an alternator in your future.
You will also probably notice a static or hum on your truck radio, especially on the AM band, that will change with engine speed.
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Originally Posted by SFeintuch
If you have around 150K on it it could be the brushes are getting short and not pressing on the comutator as hard as a full brush and that would make the light go on and off. Bad Diodes would most probably make light stay on steady. I see an alternator in your future.
Yes I agree, brush tension would be down is they were short and high loads might cause it to drop out,, so would heat on 2 working diodes. OR,,, you had a close enounter with ET.
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