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Stefan,
I agree with Jerry's number 2 item (fuses), but respectfully disagree with number 1. I have had this problem a number of times, I think that Ernie's advice was correct. Adjusting the regulators is very easy, and is, I think, the most likely solution. I would do that first. The regulators don't fail very often, but they do get out of adjustment.
Also, it is important that your mechanic adjust them under your typical load. The electrical system on this airplane must have been designed by an intern, and as the wiring and components get old and resistance gets higher, it is common to adjust the regulators for one load level and have them work fine at that level, but have them display the behavior you described for another load level.
You and your mechanic can take your pick from the advice, obviously there is more than one way to skin this cat.
Kevin
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