need new BCM?

[Waterloo]

My experience, when the volt meter starts acting up, going to zero or spiking, it has always been a failed alternator. I just installed another one here not long ago. They seem to be a replace every two year item anymore.

To note, the ProStar has two different amperage alternators that it uses. Certain models of the ProStar require the high voltage model, others like mine, can get away with a standard voltage unit. Check the alternator against your vin # to make sure you have the correct alternator installed.

Also, how old are the batteries? Any bulging? Same with batteries, getting to be junk along with the alternators.