Page 1-193 Model A Handbook: Number 9: To adjust the output charging rate, move the CENTER brush to the top (to me this means UP). It later explains that moving the brush UP decrease amperage.
In your statement, your saying "3rd Brush". So, is the 3rd/Center brush the same brush?
Thanks Guys
The 3rd (adjustable) brush is mounted to a rotating ring. The pencil points to it. It is the only one that rotates. "Center" is a poor word choice in the book. The adjustable brush is near the top when in its lowest output position. This is clear in my video.
The 3rd (adjustable) brush is mounted to a rotating ring. The pencil points to it. It is the only one that rotates. "Center" is a poor word choice in the book. The adjustable brush is near the top when in its lowest output position. This is clear in my video.
Maybe this will help. Note the alignment notch on the end of the generator body and the corresponding *** on the brush plate. Also note the position of the terminal post. The photo shows the approximate orientation of the brush plate to the body. The black wire goes from the field coils to the adjustable brush. The red wire from the terminal post to the + brush. The - brush at about 11 O'clock grounds to the brush plate.
The generator power terminal is connected to the left side power brush so it's reading the armature through the commutator. The field coil resistance is read from the isolated 3rd brush through the two shunt coils to ground. Field resistance on a common cylinder shaped generator should be around 1 to 1.5-Ohms but it doesn't tell you much. Applying a 6-volt battery to one end with an amp meter in series will tell a person whether the current draw is normal. It should be done long enough to warm the coils up. If a person pushes against the edge of the coils, the amperage draw should remain the same. If it changes when pressure is applied then there is an internal short. Normal amperage should draw from 3 to 4 amps but should remain steady during the test. Don't forget polarity. The negative post is power for this test. This will also set the residual magnetism of the pole shoes.
