[Cloud9sa]

We received the replacement voltage regulators from Don Niesser and installed them, but the problem remains. We get a high voltage warning indication, kicking out the alternators, occasionally when we cycle the gear or cowl flap motors on the ground (with a battery charger attached to the battery), but the problem happens most of the time when they are cycled in flight. We checked all the switches and relays in the landing gear and flap motor circuits, and they seem OK. In addition to getting an intermittent high voltage indication when the cowl flaps or landing gear (down) switches are actuated, sometimes the gear doors don't close when the gear legs lock into place, suggesting low voltage. We have a digital system voltage readout, and it does not indicate high or low voltage, just normally 27.7 v. Any ideas? Faulty overvoltage sensor? Something causing instantaneous voltage spikes and dips when switches are actuated? Thanks, Tracy 1977 P337G