More Avionics Wiring

Today I spent a solid chunk of time routing wires. Making wiring harnesses has been one of my the more satisfying parts of the project so far.

Firewall forward

I started by organizing the firewall forward sensor wires. This bundle contains everything from engine temps, to oil and fuel pressure and the ignition harnesses. These are now secured to the engine mount and won’t be able to move.

On the other side of the firewall I’ve secured everything and routed a portion of the harness down the left side of the fuselage in order to route the wires to proper area.

Center tunnel main harness bundle

This is the center section between the pilot and passenger seats. The main harness here is routed up to the vertical power above for all the power distribution. Other parts of this include all the serial connections, and the electric pitch and roll trim motors.

Here’s another look at all the wires and how they’re routed (Ignore the tie wraps and scraps). The harness splits to allow for the left and right lighting wires to route to the correct wing. I’ve isolated all power wires from my radio wires so that there will be no interference.

Serial Hub

This is my serial hub, it had ports for the primary and multifunction flight displays (empty slots) and the five serial avionics. The ADSB, transponder, Vertical Power, GPS and ELT (black box) all communicate via serial. This hub allows all the components to connect to the two main flight displays in parallel for each of the five serial ports. Once I’m down with all the routing of the wires this will be mounted to the sub-panel permanently.

Fuel pump and selector valve

Once I finished with the wiring I wanted to test fit my fuel pump and selector valve. I have custom fuel hoses from TS Flightlines, so I had to modify the brackets to allow the hoses to fit (you can see the cut bracket on the left below the wires). Once I mount the wings, the two fuel hoses will attach to the fuel tanks.

More Avionics Wiring

Ignition Harnesses

Tonight I spent a few hours making my ignition harnesses. My engine uses twin P-Mag ignitions, so I had to make two identical harness.

I started by removing the connectors on the ignitions so I can attach the wires. The connectors use a screw-clamp style connection.

Right ignition

Here you can see the connector attached to the ignition with the wires attached. This is a six pin connector with Ground, ignition kill, power, and RPM out. There are two additional pins that can be shorted in order to change the default timing of the ignition.

Left ignition

The left ignition connector is on the bottom of the ignition and is a bit more challenging to get to, but I managed.

Completed harnesses

Here are the bundles completed. Looking forward to the day I get to start it up!

Ignition Harnesses

Engine Controls Bracket

Yesterday I spent a few hours making the engine controls bracket. The bracket that comes in the kit is flimsy 0.032 aluminum sheet that is bent so it can attach to the bottom of the panel. I knew I wanted to use something different than the stock bracket, so I made one.

Here you can see the completed bracket. It’s made from 1/4” aluminum angle. It’s very hefty. The three holes are for the throttle, prop and mixture control. The two larger holes have relief cuts made on the back of the angle to allow for the nuts to hold the controls onto the bracket.

I then lined the bracket up with the control panel, and drilled matching mounting holes. I then added some nut plates to the panel so that this can easily be mounted flush to the bottom of the panel. Now it just needs some priming and painting and the bracket is done.

Engine Controls Bracket