Reply To: Dome light

[Robert Coates]

Yes, the AM antenna wire would be a single unshielded wire.

Getting back to the issue of interference, That can come not only from the ignition, but also from the generator. Later cars had a condenser (capacitor) on the generator to help smooth out or eliminate harmonics (which shouldn’t exist in the direct current world). This would be caused by issues with the armature or brushes. You may also try a condenser on the battery terminal of the regulator. My ’62 TBird Roadster has one, as well as the early Mustangs with a generator, for radio suppression. I am not sure what size it is, but you could try a spare from the distributor (of any car!) and see if there is any improvement. These types of condensers are not polarized like electrolytics, so there should not be an issue with the positive ground.