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can the peramiters on the pcm be altered at the dealership to make a wider operating range?
Have you checked the fuse?
The pcm cannot be altered. If its not the fuse then you probably have a weak alternator. A pcm and cluster does go out but its rare. I would have the alternator checked. It needs around 14 volts when running
The only other thing is the battery. Other than the battery and alternator thats about it. The charging system is a simple system