Thank you for the return suggestion, we have been using standard vented alternators and having similar issues. Has there been issues with the power cutoff switch? since I posted this question, we have received 1 alternator back that we sent out to check what was happening, i.e. overheating, over charging, burning out the regulator, this one came back that it was ok, charging. even though once we removed this alternator and installed another the problem was repaired. Once again, thank you for the information.

This is a common problem with the sealed alternators. If the application does not require the sealed alternators you can convert to the standard alternator. The standard alternators will not fail as frequently as the sealed ones.