Strange Alt Issue ?
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Senior User
Joined: Jul 2014
Posts: 138
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From: Westminster
Strange Alt Issue ?
1979 F150 2WD 351M
OK, to briefly update, a while back I had a battery drain issue, after replacing the Alt and Voltage Regulator, I had no more issues, until about a week ago.
Now I hardly ever drive on the Highway, but found myself on a stretch of I 70, speed limit is 65, as I'm driving along, my Alt light starts to slowly glow, and sometimes even get to total red, and I have an Amperes meter, and when this was happening, the meter would drop to below zero, when I got off the Highway, and was driving 55 and less, there was no more problem, and none since, but I haven't been driving on roads above 50 since the issue.
Anybody have an idea of what was going on ?
OK, to briefly update, a while back I had a battery drain issue, after replacing the Alt and Voltage Regulator, I had no more issues, until about a week ago.
Now I hardly ever drive on the Highway, but found myself on a stretch of I 70, speed limit is 65, as I'm driving along, my Alt light starts to slowly glow, and sometimes even get to total red, and I have an Amperes meter, and when this was happening, the meter would drop to below zero, when I got off the Highway, and was driving 55 and less, there was no more problem, and none since, but I haven't been driving on roads above 50 since the issue.
Anybody have an idea of what was going on ?
Post Fiend
Joined: Dec 2006
Posts: 9,111
Likes: 3
From: Lexington Mo
That's a tough one
But it sounds like it could be the new alternator that doesn't like the higher RPM.
Myself, I'd have to remove the alternator, and have it bench tested, to weed out it or the voltage regulator.
But it sounds like it could be the new alternator that doesn't like the higher RPM.
Myself, I'd have to remove the alternator, and have it bench tested, to weed out it or the voltage regulator.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,132
Likes: 5,777
From: S/W Missouri, Polk county
X2 on get the new alternator bench tested...I would just tell them you want another one for free. And you did double ck it is an externally regulated alt?
What ever you do, during your troubleshooting do NOT have the truck running and disconnect the +battery terminal.
What ever you do, during your troubleshooting do NOT have the truck running and disconnect the +battery terminal.
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