This picture shows the area around one of the mounting holes. If you look closely you can see pit marks where there was arching between the module and the alternator frame. This problem causes the regulator to fail. The noise caused by this problem can show up as faulty codes on VSMpc system readings and errors with the instrument readings. Also,This same problem can also be caused by loose or bad ground connections at the alternator or any number of grounding points in,on or under the coach. So always check for bad grounds first before changing out the alternator.