For the last two flights I am having electrical issues on the transponder and radio noise with the right landing light…
The first time I experienced the transponder failure was last week in flight. The VP-X indicates “SHORT” and so the transponder line was shot down to preserve it.
I did a “RESET” on the transponder breaker through the Dynon skyveiw EMS page. It worked a few seconds and then indicated “SHORT”.
Today I tried to troubleshoot the problem on ground.
*With the battery ON and tranponder ON, everything is working well.
*With the battery ON, transponder ON and engine turning, everything is working well
*With the battery ON, transponder ON engine at idle RPM and alternator ON everything is working well.
*With the battery ON, transponder ON, engine turning over 1400RPM, alternator ON it fails (“SHORT” before it shorts, I read over 15A through the transponder on the VP-X page).
*With battery ON, alternator ON, engine turning without the transponder DB connector plugged in, I have no short circuit…
According to the Dynon, the alternator is working properly.
I removed the cowl and looked for a broken wire or something like that… Nothing
I plugged the “+12V” of my car to the alternator wire and ground to the ground. Start up the car and accelerate…. Nothing, transponder is working properly…
I did not remove the panel yet as it was a bit late in France and the temperature was getting below freezing.
I also have a symptom that is surely linked to the transponder failure. When I switch on the landing light (the right one) with the same conditions as above, I get a RX on the radio with a very high noise in the headset.
Lose wire crimp?
I am getting out of ideas..