Basic Electricity END Alternators

2 WHAT DOES AN ALTERNATOR DO? -IT GENERATES ELECTRICAL CURRENT -IT CONVERTS ALTERNATING CURRENT TO DIRECT CURRENT -IT REGULATES OUTPUT ACORDING TO DEMAND -IT CAN SUPPLY A FREQUENCY OUTPUT FOR PROCESSORS (I.E. engine speed sensing)

3 Alternating Current (1 winding) 360 degrees

4 One revolution Output from the Stator (3 sets of windings)

5 Pulsed DC Output (after rectification) 12 v

6 Half wave rectification Full wave rectification (single phase) Load Alternator Battery Bridge rectifier

7 Full wave rectification (single phase) _

_

9 Pulley Front casing & Stator Rotor & Fans Rear casing Rectifier Regulator End cover

10

11

12 1. Ignition switch 2. Battery 3. Rectifier 4. Stator 5. Rotor 6. Warning light

13 Diode Trio Output Diodes Regulator DCDC ACAC Control voltage input Charge warning light

14 (W) Frequency Terminal (D+) Field Terminal (B+) Output Terminal Not shown is the earth terminal

15 Before doing the following tests consider the following. Check the fan belt is the correct tension. Do a visual check on all wires and connections. Is the charge warning light bulb working?

16 Alternator connections test

17 current and controlled voltage tests

18 Insulated side voltage drop test

19 Ground side voltage drop test

20 Alternator performance test