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Power Strokes
7.3 Tech
Check your alternators!
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[QUOTE="907DAVE, post: 349429, member: 672"] The rectifier is what converts the AC voltage that the alternator is producing into the DC voltage your truck runs on. When this goes bad you will begin to produce AC voltage. ALL the speed sensors on your truck produce AC voltage which is then interpreted by the PCM and/or ABS module and then is converted into a signal that can be broadcasted throughout the network for various uses. The problem is when the entire electrical system has AC voltage, which just so happens to be the range the sensors produce in this situation. So basically the PCM and/or ABS module are receiving a speed signal from sensors even when you are not moving, or the signal it is receiving when your are moving is incorrect or unstable. [/QUOTE]
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Check your alternators!
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