the
generator is keeping the battery charged, and if a change in the
charging rate is necessary, the necessary adjustments may be made. If
a customer does not bring in his car every two weeks, call him up on
the phone or write to him. The interest which you show in his battery
by doing this will generally result in the customer giving you all his
repair business, and he will also tell his acquaintances about your
good service. This will give you considerable "word of mouth"
advertising, which is by far the best form of advertising and which
cannot be bought. It must be earned by good battery service.

Adjusting a third brush generator. The best rule to remember for
changing the output of a third brush machine is that to increase the
output, move the third brush in the direction in which the commutator
rotates, and to decrease the output, move the third brush in the
opposite direction. Move the third brush only 1/16 inch and then
sandpaper the brush seat with 00 sandpaper. Allow the generator to run
for about twenty minutes to "run-in" the brush. Then vary the speed to
see what the maximum charging rate is. If the change in the charging
rate is not sufficient, move the third brush another 1/16 inch and
proceed as before until the desired charging rate is obtained.

Adjusting Vibrating Regulators. The output of generators which use a
vibrating regulator is adjusted by changing the tension of the spring
fastened to the regulator arm. In many cases this adjustment is made
by means of a screw which is turned up or down to change the spring
tension. In other cases a hook or prong is bent to change the spring
tension. Where a coil spring is used, lengthening the spring will
decrease the tension and lower the output, while shortening the spring
will increase the tension and raise the output.

Vibrating regulators are of the "constant" current or the
"constant-voltage" types. The constant current regulator has a winding
of heavy wire which carries the charging current. When the charging
current reaches the value for which the regulator is set, the
electromagnet formed by the coil and the core on which it is wound
draws the regulator armature toward it and thereby separates the
regulator points, which are in series with the shunt field. A
resistance coil, which is connected across the regulator points and
which is short-circuited when the points are closed, is put in series
with the shunt field when the points separate. This