Craftsman 143.991200 Specifications download pdf (Page 39)

CONVERTING ALTERNATING CURRENT

TO DIRECT CURRENT

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 (diag.

3). A single diode makes use of only one half of the

A.C. signal and is known as HALF WAVE

RECTIFICATION (diag. 4). This is acceptable in

certain applications. In certain situations it is

necessary to make use of the entire A.C. signal. To

accomplish this, multiple diodes in a bridge

configuration are used to produce FULL WAVE

RECTIFICATION (diag. 5).

Full Wave Rectifier Bridge Rectifier

The full wave rectifier makes use of the entire A.C.

signal, converting it to D.C.

COMPONENTS

BATTERY

The batteries used in conjunction with Tecumseh

engines are 12 volt lead acid or maintenance free

style. The chemical energy produced by the dissimilar

metals of the battery plates provides a electrical

potential that is used to power the electric starter or

unit accessories. Consult the original equipment

manufacturers service manual for battery size,

capacities, and testing procedure.

WIRING

The wires used in Tecumseh electrical systems are copper stranded with an insulated coating around the

copper strands.

CONDITION: All wiring must be fully insulated between connection points, securely fastened and free of

foreign material (such as rust and corrosion) at the connection points. This is especially important in the use of

batteries where much of the potential may be lost due to loose connections or corrosion. Remember to check

the insulation on the wire. All it takes is a pin hole for leakage to "ground out" on the engine or frame. This is of

special concern when moisture or water is present.

CATHODE

ANODE

HALF WAVE RECTIFIER

(SINGLE DIODE)

- VOLTAGE

+ VOLTAGE

A.C. INPUT

D.C. OUTPUT

+ VOLTAGE

- VOLTAGE

D.C. OUTPUT

FULL WAVE RECTIFIER

(BRIDGE RECTIFIER)

A.C. INPUT

- VOLTAGE

A.C. INPUT

+ VOLTAGE

- VOLTAGE

+ VOLTAGE

+ VOLTAGE (D.C.)

BAND OR OTHER

MARKING INDICATES

CATHODE END

Current flows through a diode when the anode is more positive than the cathode. The cathode end of the diode

should point toward the battery when diode is used between a charging system and a battery.

Half Wave Rectifier Single Diode

The single diode allows only the positive half of the A.C. signal through. It does not allow the negative portion

through.

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Craftsman 143.991200 Specifications Page 39

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