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This sounds like it could be one of several items. You will need to do some troubleshooting to locate the cause. 1. Use a multimeter to test the voltage that is coming from the ALT. Make sure that it is not above 14.5V when the engine is on plane.2. Use an IR thermometer and test the temp of the engine after it has began to slow down. Make sure that it is below 180*F. If it is higher, there may be a blockage in the cooling system, or the raw water pump would need serviced. 3. Remove the oil pressure sender and install a local gauge there. Watch the pressure of the oil as you run the engine. Make sure that it does not drop when the engine slows.