Posted by John in La on September 16, 2015 at 18:16:46 from (96.33.136.54):
1998 F150 with a 4.2 V6 Think it still has the original alternator on it as truck only has about 70,000 miles.
Charging system works great and battery is always full. Then I had to floor the accelerator to merge with interstate traffic and the charge light came on. As soon as I let off accelerator the light went off. I very seldom; maybe once in a blue moon floor the accelerator so it may have been like this for years I just never noticed it.
Thinking that the serpentine belt may be loose I checked and it is tight. Belt is about 2 years old and I have never heard any sound that would make me believe the belt is slipping. Checked battery with volt meter and charge rate seems normal at idle in drive way.
So I just blew it off as a fluke and have been driving truck for several weeks and the charge light has not come on once. So today I got to thinking about it. Took it out for a drive. Sure enough; you drive like a normal person should and charge light never comes on. But if you floor the accelerator; the light comes on every time till you let up on it.
Any ideas on what might be going on? I check the belt again today and it looks good and is tight.
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