Voltage drop while accelerating
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New User
Joined: Feb 2008
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Voltage drop while accelerating
Hi,
Ive got an 04 F250 and when I accelerate the battery light comes on. I tested the voltage on the battery while idle and all is fine exactly 14.4 volts. However when I accelerate to about 2500 or 3000 rpm the voltage drops to 12.6 - 13.0 and then the light comes on. Water levels in the battery is fine too. Is this a battery problem or a failing alternator?
Ive got an 04 F250 and when I accelerate the battery light comes on. I tested the voltage on the battery while idle and all is fine exactly 14.4 volts. However when I accelerate to about 2500 or 3000 rpm the voltage drops to 12.6 - 13.0 and then the light comes on. Water levels in the battery is fine too. Is this a battery problem or a failing alternator?
Elder User
Joined: Feb 2007
Posts: 805
Likes: 1
From: South Bend, IN
Sounds to me like a failing alternator. You should be able to have that tested at just about any decent local auto parts store. You could have a slipping belt too but I think you'd get other issues with that situation.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
You have a diode issue in the alternator. Once thing you can check for (although the battery shouldn't allow it) is AC voltage. There should ne next to none at idle and then more as you reach where the alt has failed.
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accelerate, accelerates, accelerating, accerlrate, alternator, battery, change, drop, drops, engine, f250, ford, light, v10, voltage
