F150 4x2 Screw 4.6L voltage increase and decrease
Thread Starter
Junior Member
Joined: Feb 2009
Posts: 22
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F150 4x2 Screw 4.6L voltage increase and decrease
Hello all,
I recently had my alternator replaced when the old one went bad.
Ever since I got the new alternator, the voltage increases and decreases constantly during my commute. It is very noticeable during the night when I have the lights on and can also tell from the dash illumination.
It will oscillate anywhere from roughly 12.3v to 14.3v
What do you think the problem could be?
Thanks,
Z
I recently had my alternator replaced when the old one went bad.
Ever since I got the new alternator, the voltage increases and decreases constantly during my commute. It is very noticeable during the night when I have the lights on and can also tell from the dash illumination.
It will oscillate anywhere from roughly 12.3v to 14.3v
What do you think the problem could be?
Thanks,
Z
Last edited by zuperman; Dec 10, 2014 at 04:24 PM. Reason: additional text in Title
Senior Member
Joined: Feb 2014
Posts: 1,068
Likes: 97
From: Birmingham, Alabama
There's a good chance that it's your "new" alternator. Remanufactured alternators from parts stores are a gamble. Even a brand new one from a dealership can be a lemon. Have it tested.