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As a follow up to this and in concert with the previous post, I recently noticed that the voltage for my system was erratic, rising as high as 28.9 volts but jumping around. It would settle down if I cycled the regulator switch back and forth between reg 1 and reg 2. It would then start rising and jumping again as I was flying. I replaced this regulator switch with a new one ($100!) and the problem is solved. Both regulators rock solid at 27.8 volts. So the basic message is any résistance in the regulator circuit will cause this sort of issue as the voltage drop along the sense lead to the regulator becomes meaningful. Cleaning the switch with a solvent may also fix this but there is a lubricant in there that will be washed out by this so you will probably see the problem come back sooner.
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