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helosailor, as I have already stated, the diodes are encapsulated in a module with the piezo. Keeping it simple: I removed the Acoustical Warning Alarm Assembly (AWAA) from the cockpit engine control panel; thus, totally isolating it from the input sensors. I connected +12VDC to the appropiate termnal on the AWAA. Then, one at a time, I connected each alarm point/terminal to ground (the negative side of the battery in this case). The piezo never sounded. It may be the piezo is not bad - it could be a broken wire - , but without breaking open the AWAA module there really isn't a way for me to tell. At this time I don't want to smash the module. I have remounted it mechanically to fill the hole in the control panel to keep rain out.
Duke
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