New alternator, internally regulated and works great as long as it has a load. About 2 hours into a flight if the lights are all off and the only load is the Garmin 696, the EFIS and two MFDs the amps will go to zero and the oil pressure indication will go low and the oil temp will go up. As soon as you turn the strobes or nav lights on everything returns to normal. I have no idea why the load makes a difference. I am very electrically challenged. This has happened with 3 different alternators. Any ideas from the brain trust would be appreciated.