Electric trim blowing fuse

homeap · #1 10-30-2022, 10:27 AM

I have a 2012 RV-12 that I purchased flying one year ago. When I turn on the master it immediately blows the electric trim fuse. I have looked in the panel for burnt wires and did not find anything. I have the Dynon Skyview touch system with auto pilot. I will be looking at the KAI as well as wiring schematics but I wanted to see if there were any known areas or suggestions that could cause an issue. I greatly appreciate your input.

Mich48041 · #2 10-30-2022, 11:28 AM

Break an old fuse apart to get the metal terminals. Solder a wire to each terminal and plug the terminals into the fuse panel. Now connect a test light to the wires that you soldered. Use a test light that does NOT have an internal battery. Possibly this one from Harbor Freight: https://www.harborfreight.com/612v-c...ead-63603.html
When you turn on the master switch, the test light should illuminate if there is a short circuit. Now watch the test light as you wiggle wires and disconnect D-Sub connectors.

Piper J3 · #3 10-30-2022, 11:57 AM

homeap - You're fairly new to the forum, so I'll just pipe-up here and tell you Joe is excellent at electrical troubleshooting. He'll stick with you until you find and fix the problem. VAF is your friend....

homeap · #4 10-30-2022, 04:12 PM

Joe and Jim,

Thank you so much for the input, I will purchase one from Harbor freight and get started. If you think of any other suggestions, let me know.
Thanks again!

Russ

Mich48041 · #5 10-30-2022, 07:09 PM

Russ,
Below is a schematic of a RV-12 stabilator Trim circuit.
This version may or may not be for your aircraft. It is the only SkyView version that I have.

DHeal · #6 10-30-2022, 10:03 PM

I would remove the tailcone fairing and carefully look at each wire that connects to the trim servo motor. These are very thin wires and one could easily be shorting on a nearby ground.