If your troubleshooting isolates the problem to fuselage wiring, one of the first places I would suggest
looking is where the wiring is captured by a metal plate above the rudder pedals.
Since the plane was one of the first ones built, it might not have the "Over Rudder Wireway", Van's part number F-12125
Another suspect area is where the wires pass through the bottom of the instrument panel.
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