@jetdriven Thanks. I know this is an old thread, but I was wondering specifically about the stormscope inhibit issue. Reading through the thread, you suspected that alternator noise was affecting the stormscope (since it stopped when turning off the alternator field) and tried to replace the diodes to fix. But, the final post after the diode replacement was that nothing had changed. Do you recall if the stormscope issue was ever figured out?
I just put on a brand new plane power alternator, and right after started getting stormscope inhibit errors. It had worked fine for years before the new alternator. Just looking for things to troubleshoot. We have already tried cleaning and tightening all grounds.
With some extra searching, I did just find a post over on the beech forum from Aug 2016 by a Mooney owner. Looks like that may have been from you also. I will quote it below just to give some closure to this thread. Let me know if you have anything else to add. Maybe some Plane Power alternators are just noisier than average.
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My WX-1000 recently started giving an error 45, which is likely interference. Pulling the alternator field circuit breaker instantly restores it. So did turning some stuff off and lowering the electrical demand. I was able to duplicate it. I grounded the Stormscope processor to the negative battery cable, no change. Neither was changing the 2400uF noise capacitor on the main alternator power wire. I even swapped out the Plane Power alternator rectifier. Still have the original OECO voltage regulator. No change, still error 45 above ~30 amps of alternator load. This noise is above the audible range. Note I do not have an alternator filter capacitor mounted on the alternator, but the intercom is relatively free from electrical noise (strobes, landing gear an flap motors, etc).So i did find a loose ground on the engine where it grounds to the firewall. I cleaned and tightened that up, and then I also ran the stormscope processor power and ground leads through a noise filter. That fixed it. I'm not sure which mod fixed it, butIt was high frequency AC noise from the alternator, in my case. it gets into the power buses and the airframe, and can freak the processor out.
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