Started the Electrical Wiring

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Running all of the electrical wiring is a larger task than I anticipated. Figuring out what needs connected to where is easy enough, doing so in a nice tidy, serviceable and long lasting way is what’s hard.

I secured the battery with a battery hold down strap. I had to shorten it significantly and heat weld part of it since I don’t have a sewing machine. A piece of foam is placed under the battery to keep it from sliding around.

Battery hold down strap
Battery hold down strap

I added a ground controlled relay for the master power. When the matter switch is off no power enters the cockpit and nothing electrical is energized. For those unfamiliar with airplanes, the engine ignition system​ is independent from the electrical system so the master switch will not turn off the engine nor prevent it from starting. The ignition is controlled with the keyed switch, more on that later.

Master relay
Master relay

Installed a diode across the starter solenoid. This reduces arcing across the starter switch contacts. Also, ACS service bulletin sb92-01  applies to my ignition switch and requires the installation of the diode. To protect the diode I put it in a small tube and covered it with black heat shrink. 

Starter solenoid
Starter solenoid

The regulator was mounted to the other side of the fuselage and it’s wire run through wire clamps on the engine just like the EGT and CHT probes.

All of the circuit breakers are on the dashboard so most of the power distribution happens there.

A small ground buss provides a convenient place to connect ground wires.

The keyed switch serves a few functions. When the key is removed the engine magnetos are disabled so the engine will not start, without this simply bumping the propeller could start the engine. The key also has a momentary start position to activate the electric starter, just like a car. It has a run position wherever both magnetos are allowed to operate and a left & right position where you can select the right or left magneto to ensure both are working before taking off.

ACS ignition switch
ACS ignition switch

Still have some other items that need wired, strobe, fuel pump, USB chargers and the radio. I’ll discuss that in a future post.


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