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  #1  
Old 04-09-2023, 10:06 PM
ChuckC ChuckC is offline
 
Join Date: Apr 2011
Location: Meridian, ID
Posts: 85
Default No Electrical Power

RV-12, Serial Number 120445, with 912ULS Rotax engine; Dynon: with D1000 EFIS, A/P, ADSB In/Out, GPS2020, Transponder, Pitch and Roll Servos; and, Garmin: SL40 Radio.

Engine starts and runs fine. Dynon EFIS comes alive.

There appears to be no power to the A/P, ADSB In/Out; Dynon GPS2020; Dynon Transponder; Dynon Pitch and Roll Servos; and, Garmin SL40 Radio;and, all the switches from the Trim Switch thru the AutoPilot. All the fuses are good. Engine battery is two years old, appears to be holding a charge and turns the prop easily.

Looked under the cowling and in the avionics bay, and, found no mice or birdís nest. Looked for loose connections and abraded wiring, found none.

Plane was last flown in late November and was flying properly at that time. It has sat in a hangar from December thru March because of the snow and cold weather. Now, a bunch of stuff is not working. I am not an electronics wizard. Any suggestions would be appreciated.
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  #2  
Old 04-09-2023, 10:31 PM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Colorado Springs, CO
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Is there a relay for avionics?
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  #3  
Old 04-09-2023, 11:16 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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I assume your fuses are OK?
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  #4  
Old 04-10-2023, 08:34 AM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 1,044
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Avionics Master switch internal failure or associated wiring? You can look at the overall wiring diagram for your version of the RV-12 on Van's Aircraft's website at:

https://www.vansaircraft.com/downloa...SystemDiagrams
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Last edited by DHeal : 04-10-2023 at 08:39 AM.
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  #5  
Old 04-10-2023, 01:48 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
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Switches need exercise just like people do.
Turn the avionics switch on and off 100 times to wear away the corrosion.
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  #6  
Old 04-10-2023, 04:20 PM
jmra72a jmra72a is offline
 
Join Date: Oct 2010
Location: Kalamazoo, MI
Posts: 61
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Is your plane equipped with the Advanced Control Module? If so, you should be able to access it through the Dynon EFIS to see what is alive and what is not.
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  #7  
Old 04-10-2023, 04:26 PM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
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Could very well be like Joe says – corrosion. I’m finishing annual condition inspection after plane sat in hanger all winter. See my post https://vansairforce.net/community/s...highlight=hate. Weather has been dry for a week and I powered-up plane today and everything looks hunky-dory.

I hate moisture on electrical stuff…
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  #8  
Old 04-10-2023, 09:00 PM
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rcarsey rcarsey is offline
 
Join Date: Jul 2012
Location: North Brunswick, NJ
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It almost sounds like the avionics switch itself is broken.

I've had two Otto switches fail internally -- one time the switch "felt" different when using it.. the other time, I couldn't tell from the outside. In both cases though, it was due to a short circuit and the switch's contacts welded themselves to a contact pad.

I'd check to see if you have power at the switch..and if power is getting through the switch when activated.
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  #9  
Old 04-10-2023, 11:31 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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I am pretty sure the auto pilot servos do not source power via the avionics switch, so if they actually are not receiving power, that would point towards some other cause.
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Formerly of Van's Aircraft Engineering Prototype Shop
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  #10  
Old 04-11-2023, 01:09 PM
Tommy123 Tommy123 is online now
 
Join Date: Jul 2018
Location: Naples fl
Posts: 370
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Corrosion. Check the fuses if you have any. My car shut itself down the other day, it was corrosion in the "engine" fuse.
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