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Saturn was messing around with something like that. They added a motor to the driveline instead of replacing the p/s. It needed another tensioner to make it work. I believe they used a 48V power system in the car instead of 12V.
I think the theory is to use the motor to reduce fuel consumption during accelleration.
i had heard that some auto manufactures were trying to get the higher voltage to be a new standard. I think they were saying the alternator works more efficiently in that range.
Don
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