Specifications

44
Diodes
In order to charge a battery it is necessary to convert
alternating current (A.C.) to direct current (D.C.) This
is accomplished by using a diode or rectifier. Using
a single diode will make use of one half of the A.C.
signal and is known as HALF WAVE RECTIFICATION.
This is acceptable in certain applications. In certain
situations it is necessary to make use of the entire A.C.
signal. To accomplish this we use multiple diodes in
a bridge configuration which produces FULL WAVE
RECTIFICATION (diag. 89).
Solenoids
A solenoid is a heavy duty switching mechanism used
to handle large amounts of current. It consists of a
heavy strip of metal activated by an electromagnet. The
metal strip connects two contact points and "makes" or
"breaks" the electric circuit. Because the metal strip
is heavier than most switch contacts, it does not pit or
burn away as lighter switch contacts will.
To test a grounded solenoid, connect positive (+)
solenoid terminal (next to solenoid ground) to the
positive (+) battery terminal. Connect negative ground
(-) terminal of the solenoid to the negative (-) battery
terminal. If solenoid is in good condition, the plunger
will "snap" and close the main contacts (diag. 90).
NOTE
With a grounded solenoid, battery B(+) is supplied
to activate. With insulated solenoid, battery B(-) is
supplied to activate.
To test an insulated solenoid, connect the terminal
marked "B" to the positive (+) battery terminal. Connect
terminal marked "G" to the negative (-) battery terminal.
If the solenoid is in good condition, the plunger will
"snap" and close the main contacts (diag. 91).
90
GROUNDED SOLENOID
START POSITION
CIRCUIT CLOSED
RUNNING AND
STOP POSITION
91
INSULATED SOLENOID
START POSITION
CIRCUIT CLOSED
RUNNING AND STOP
POSITION CIRCUIT
ANODE
CATHODE
BAND OR OTHER MARKING
INDICATES CATHODE END
A.C. INPUT
(+) VOLTAGE (D.C.)
The full wave rectifier makes use of the entire
A.C. signal, converting it to D.C.
DIRECTION OR FLOW OF CURRENT
89
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