Yeah, it's a serious vulnerability, but I think maybe water pressure has something to do with it too. It's mounted rather low in our trucks, too. And unfortunately the regs are internal on our alternators, otherwise I guess it would be a much easier proposition. Or if you knew how to get in there and change them out... <shrug> All I know is we had three of 'em go in one day but some of the most aggressive drivers who went back for several passes through the water did not have them go out.