Our RV-10 has been working great for 2 years.
The system is EarthX PC680, Recently replaced main contactor (from ACS), Plane power 60a alternator, VP-X Pro, Garmin GTN650, GTR20 Remote Radio, Dual GDU460 (G3X).
The issue was first reported as BOTH COM radios getting X'd out. When I fired the plane up (engine off), COM2 was faulted with a "short circuit" but I reset it and it was fine. I could not replicate any issues. The last person who flew the plane had the radios get X'd out around the time of being handed off to departure.
After starting the plane, everything seemed okay until I tried to taxi. Advancing the throttles causes the amp reading on the VP-X screen to increase dramatically and then it cuts them both out with "short circuit".
Here's a video. https://youtu.be/q11zGFy63vU
One thing I notice right away, is that the system voltage finally gets up to 13.8 only as the engine finally hits over 1700rpm. In the past it would hit 14.1 at nearly idle RPM. NOTE: The data here is at 1 second intervals, before anything has time to go wonky. It's just an example of the lower than previous voltages.
At first this seems like belt slippage, voltage regulator, or alternator failure. But the Coms shorting out has me completely thrown for a loop. Thoughts?
The system is EarthX PC680, Recently replaced main contactor (from ACS), Plane power 60a alternator, VP-X Pro, Garmin GTN650, GTR20 Remote Radio, Dual GDU460 (G3X).
The issue was first reported as BOTH COM radios getting X'd out. When I fired the plane up (engine off), COM2 was faulted with a "short circuit" but I reset it and it was fine. I could not replicate any issues. The last person who flew the plane had the radios get X'd out around the time of being handed off to departure.
After starting the plane, everything seemed okay until I tried to taxi. Advancing the throttles causes the amp reading on the VP-X screen to increase dramatically and then it cuts them both out with "short circuit".
Here's a video. https://youtu.be/q11zGFy63vU
One thing I notice right away, is that the system voltage finally gets up to 13.8 only as the engine finally hits over 1700rpm. In the past it would hit 14.1 at nearly idle RPM. NOTE: The data here is at 1 second intervals, before anything has time to go wonky. It's just an example of the lower than previous voltages.
![Hi2fkyA.jpg](/proxy.php?image=https%3A%2F%2Fi.imgur.com%2FHi2fkyA.jpg&hash=a5307b527600e5af5fcb500463aeb136)
At first this seems like belt slippage, voltage regulator, or alternator failure. But the Coms shorting out has me completely thrown for a loop. Thoughts?
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