I believe this issue may have been reported before.
I have an early model PlanePower 60A internally regulated alternator on my RV-10. The last time the cowl was removed for an oil change I noticed that the externally mounted overvoltage module mounting had failed and the module was hanging loose by it's single wire. The single small screw attaching the module was attached very close to the edge of another opening in the rear sheetmetal cover on the alternator. The module is an integral part of a tab extending from the bottom of the module. In my opinion this invoked a "tuning fork" effect amplyfing vibration and cracking the sheet metal cover. (Later versions of this alternator have the overvoltage protection mounted internally)
After consulting PlanePower, the module was remounted to an area with more edge distance and also bedded in RTV to prevent vibration.
Dick Sipp
RV-10 330 hours
I have an early model PlanePower 60A internally regulated alternator on my RV-10. The last time the cowl was removed for an oil change I noticed that the externally mounted overvoltage module mounting had failed and the module was hanging loose by it's single wire. The single small screw attaching the module was attached very close to the edge of another opening in the rear sheetmetal cover on the alternator. The module is an integral part of a tab extending from the bottom of the module. In my opinion this invoked a "tuning fork" effect amplyfing vibration and cracking the sheet metal cover. (Later versions of this alternator have the overvoltage protection mounted internally)
After consulting PlanePower, the module was remounted to an area with more edge distance and also bedded in RTV to prevent vibration.
Dick Sipp
RV-10 330 hours
