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Power Strokes
6.4 Tech
Battery Light on and codes.
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[QUOTE="Clifford6.4L, post: 1265380, member: 19198"] I had a similar problem with my '08. One alternator was barely working and the other alternator was peaking at 21amps and it ended up killing the batteries. I got them replaced and a month later it started turning on the battery light again and my instrument cluster would turn off as well as the headlights. One of the plugs into one of the alternators was not fully connected. Check the plugs and the wires going into the alternators. If that's not it then I believe the PCM controls the alternators on the 6.4s. [/QUOTE]
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