[rotorwrench]

You don't really need an electronic flasher with regular incandescent bulbs. The bi-metallic flashers with the pilot terminal should still be available for 6-volt systems. They don't need a ground since all they have is the bi-metallic strip to function the switch. Power for the flasher really should come from the generator terminal but it may work if connected to the battery. Most loads are connected on the generator side of the ammeter so that they will register on the ammeter correctly. At night is when a person wishes for LEDs. With lights on and turn signals functioning, the load on the generator is pretty heavy. It would need the 3rd brush adjusted a good bit for peak amp output.

The model A system was originally designed for two headlights and one tail light but we tend to add more to them in the modern era to keep us safer on the road. Turn signals didn't show up till after the war as an optional accessory. They stayed that way till the late 40s and early 50s. The Mercury cars got turn signals before the Ford cars did.

With an original ammeter, a person can see how many amps the generator is putting out. For lights on operation a person is going to need more than 4 or 5 amps output. During the daytime hours, the ignition will be the largest constant draw so it will draw 3 to 4-amps. This will show just a bit of charge while the car is running with no lights on. Hit the brake lights and watch the amp meter go into discharge. Turn on the headlights and it will go way down on the amp meter. Rotate the 3rd brush down closer to the output brush so that the amp meter won't dip below the centerline with the lights on or at least not too much below the centerline. A person wants the battery to charge a little bit anyway. Add turn signals and brake lights and all that intermittent stuff and the amp meter will drop with the load. This is why so many folks are going to LEDs for all of the lights. With halogen headlights, a person has to have an alternator just to keep up with the load. With LEDs the old three brush will have longer legs toward keeping up with the load. If a person runs at night a lot then they have to adjust for that load and then run the lights in the daytime too if they don't want to keep adjusting the brush. This will keep the battery from being overcharged at that amp setting.