While planning out routing of conduits under the baggage area rear seat floors, I also took time to plan out battery cable routing.
My electrical system will consist of a single battery, single alternator and backup generator setup, and the battery will be placed in the standard location in the tail cone. I have also decided to ground the battery at the tail cone, and this means that I only need to run a single 2AWG battery cable from the tail cone to the firewall.
I purchased a 15ft length of 2AWG tefzel cable with a red colored casing to easily identify it as the positive power wire, and carefully planned out where I would need to attach brackets to support the cable as it gets routed down the left side of the airplane.
The cable run under the baggage area requires the most supporting brackets as this is a relatively long run, and aside from making sure that the cable would be secure, I also wanted to keep it as far away from the conduit runs as possible.
From the tail cone, the battery cable runs through a tooling hole (enlarged to 1/2" so that a grommet can be inserted) in the F-1006 baggage bulkhead and along the F-1021-L outboard baggage rib. It passes though one of the lightning holes in this rib to the inboard side and then continues under the step along the left side on the cabin.
In the location where the cable passes through the lightning hole, I fabricated some brackets to hold and guide it on each side of the lightning hole.
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| Brackets to guide the battery cable along the F-1021-L baggage rib |
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| Battery cable enters the baggage area through a tooling hole in the baggage bulkhead |
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| Brackets (riveted to the rib) hold the battery cable in place as it passes through a lightning hole in the F-1021-L outboard baggage rib |
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| An additional bracket holds the battery cable securely with an adel clamp as it continues along the baggage rib and passes under the step. 1/2" split conduit was wrapped around the cable in the area where it goes under the step, and this area can be inspected at any time through the step access panel installed in the baggage floor |
Forward of the baggage area, the battery cable continues through an existing hole in the F-1034A Fuselage Bulkhead, in between the rear seat ribs and through another existing hole in the F-1005A Rear Spar Bulkhead.
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| Battery cable passing under the step and through the F-1034A Fuselage Bulkhead |
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| Battery cable continues forward to the F-1005A Rear Spar Bulkhead |
Once past the Rear Spar Bulkhead, the battery cable rises as it passes though a lightning hole in the F-1015B-L Seat Rib Intercostal (and held in place via another fabricated bracket and adel clamp), and then passes low through the F-1004C and F-1004D Center Section Bulkheads as it goes over the F-1004B Center Section Bulkhead.
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| 1/2" holes punched in the F-1004C and F-1004D Center Section Bulkheads to allow the battery cable to pass low over the Center Section Assembly. A protective sleeve surrounds the cable as it goes over the Center Section Bulkhead |
Continuing forward, the battery cable passes through an existing hole in the F-01042-L-1 Bulkhead Side Channel and is held with an adel clamp to the F-01088-L-1 Fwd Fuselage Rib. It finally passes through another 1/2" punched hole in the F-01002-L-1 Fwd Fuselage Bulkhead and ends at the firewall.
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| Battery cable passing low over the landing gear mount and through the F-01042-L-1 Bulkhead Side Channel |
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| Held by an adel clamp, the battery cable passes over the F-01088-L-1 Fwd Fuselage Rib and through a hole punched in the F-01002-L-1 Fwd Fuselage Bulkhead |
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| Battery cable passes under the rudder assembly and will later be attached to a fat wire tie point on the firewall |
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| Final steps of battery cable routing involved torquing and torque sealing all screws and bolts holding the cable in place |
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| 1/2" split conduit was also used to wrap and protect the battery cable in the narrow space between the F-1015A-L Outboard Seat Rib and the side skin. The bracket used to secure the cable as it passes through the lightning hole in the F-1015B-L Seat Rib Intercostal can also be seen above left |
Dates: April 2 - April 29 2026
