New alternator, battery light - F150online Forums


New alternator, battery light

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  #1  
Old 07-16-2010, 11:50 AM
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New alternator, battery light

I just replaced my alternator after starting to see an intermittent battery light when the engine warmed up. Replaced with a new alternator. Batterycables were cleaned prior to reconnecting everything. Engine off voltage is 12.78 and engine running is 14.54 VDC. Any ideas what to check?
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Old 07-16-2010, 12:48 PM
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More info - drove over to the auto parts store and had them run a test. The diode check and all the voltage outputs look good with engine running.
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Old 07-16-2010, 02:26 PM
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Can you post some info on your truck or complete your profile ?
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Old 07-16-2010, 02:30 PM
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Sure 1997 Ford F-150, 4.2L, 5 speed, ca. 130k miles. Thanks.
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Old 07-16-2010, 04:16 PM
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Solved. After reading every F150 battery light article I could find it seems they all end up pointing to the alternator. The new Ultima brand alternator was defective. Note this was supposed to have all factory new components. You'd think these got tested before leaving the bench.
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Old 07-17-2010, 02:51 AM
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Quote:
Originally Posted by Jim Michael View Post
Solved. After reading every F150 battery light article I could find it seems they all end up pointing to the alternator. The new Ultima brand alternator was defective. Note this was supposed to have all factory new components. You'd think these got tested before leaving the bench.
Yea, ALL NEW factory components made in China or some 3rd world country you can't even pronounce the name off. That's why I don't like rebuilt alternators or starters (or most other rebuilt stuff for that matter). Only the high dollar stuff has any chance of getting parts that are reasonably equal to OEM. Tested??? I don't think you'd want to see what goes on inside a rebuild shop or see who is doing it either.
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Old 07-25-2010, 01:35 PM
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I HAVE THE SAME PROBLEM I GUESS i NEED TO RETURN THE ALTINATOR TO ORILEYS OR DOES THIS MEAN IT IS GOOD JUST THE LIGHT IS NOT WORKING CORRECTLY????

oops sorry for cap lock
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Old 07-26-2010, 06:39 PM
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I changed 2 altinators and I still dont have enough juice coming from altinator
What the heck else can it be????????????????????
Battery light still on 3 altinator installed and then tested and it is still not charging.
WHAT can it be????????
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Old 07-27-2010, 05:11 AM
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What do you mean
Quote:
dont have enough juice coming from altinator
Did you check the fuse for the rectifier field ?

Here is a thread on the checking of the fuse and the harness ( field ) to the alternator
https://www.f150online.com/forums/el...nator-why.html
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