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Bob,
Yes, you can jumper across the master contactor for testing purposes.
I suspect there is an indication problem, not a problem with the contactor.

Bob,
Measure the voltage again. But this time do NOT connect the black lead of the
handheld meter to ground. Instead, connect the meter black lead to the
contactor stud on the load side. And c ...

Bob, does the engine crank and start okay? If so, then maybe the solenoid is
good. Once the engine is running, the aircraft electrical system is powered by
the alternator, not the battery. If t ...

Search eBay for item number:234084413139

Here is a pinout guide if that will help:
http://www.aeroelectric.com/Installation_Data/Narco/COM11-11B-111B-120.pdf

The eBay item I suggested is not a genuine John Deere part. It is probably
made in China. I have been using a similar voltage regulator in my RV-12 for
100s of hours without a problem. It is ve ...

One way to check a rectifier/voltage regulator is to substitute a new one. if the new one works, then the old one must be bad. Search eBay for AM101406 which is for John Deere tractors. They sell f ...

Antenna problems could allow reception but not transmission.
But a faulty antenna would not explain the carrier being transmitted without modulation.

Suspect the mic jack or wires between the mic jack and radio or the radio itself.
Also make sure the radio is well seated into its rear connector.

The AOA Limiter that I envision would not limit the stick to a fixed position.
The aft limit of stick position would contently change and be determined by the AOA.
Think of it as an autopilot, not f ...

Dan T.
Thanks for your suggestion.
Anything that will help prevent the pilot from stalling the airplane is beneficial.
But pilots have been known to ignore blaring stall warning horns and stick sha ...

Many fatal aircraft accidents are caused by stalling and spinning into the ground.
Why not make airplanes stall proof? This is not a unique idea. Aircraft have been
built with limited control stic ...

Sounds good Charlie. The nice thing about building our own aircraft is that we
can do it the way we want. Many times there is not right or wrong way, just
different ways, a matter of personal pr ...

If the fuse block is mounted under the instrument panel or on a side panel,
then it won't matter how the wires exit. Fuses do not necessarily have to be
accessible in flight. It is a lot safer to ...

Falken doesn't have any in stock. You will be loaning them money.
It looks like all of the load wires come out of the bottom side which will
take up more panel space. It is way too expensive.
- ...

The vast majority of electrical problems are due to bad connections,
for instance loose or corroded terminals.
Another possibility is an indication problem with the voltmeter.
Connect a separate v ...

Here is another way to override copilot's trim switches.

Wow Eric, you went to a lot of work to help out aircraft owners and builders.
Your excellent documentation will allow even a complete novice to build an
overvoltage protection circuit. I like the ...

There is a discussion right now on Vansairforce about the GTR 200 and headsets.
https://vansairforce.net/threads/headset-coexistence.232642/
Maybe someone there can advise you.

Try using an audio isolator transformer, $9 at Amazon.