I'm familiar with this issue--it gets even more expensive when an airplane is envolved. I'm an officer in a Chicago-area flying club--we do our own oil changes and other maintenace that pilots are allowed to do, as opposed to FAA-certified mechanics/technicians.
The problen is that the white tail position light (running light) is mounted on the rudder--the moving part not the stational tail fin. With age and lots of flexing (it is a major control surface!) the wire breaks. Pilots are allow to change the light bulb but not trouble shoot and repair the wiring. We trouble shoot, but a certified technician is required to solder the wire, and now you have a hard splice, just like the car stereo. It's about a half-hour job, and we have one or two Airframe & Powerplant licensed mechanics in the club so it was easy to make the airplane legal at night.
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