The generator

The generator

An exploded view of the generator is shown in FIG 11:3.

Testing when generator is not charging

1. Check that drive belt slip is not the cause of the trouble. Tension should be such that the belt can be deflected about inch under a 22 Ib pressure as shown in FIG 1:49. To adjust the drive belt tension remove the three nuts B, FIG 1:49, on the generator pulley and this will split the pulley into two parts between which are placed spacer rings. The tension of the belt is increased or decreased by either reducing or increasing the number of spacers. Place the spacer rings removed from between the pulley halves on the pulley outer face so that the rings may be reinserted when fitting a new belt. Tighten the three nuts to a torque wrench setting of 14.5 lb ft. Care must be taken not to over-tighten the belt or excessive loading will be placed on the generator bearings causing excessive bearing wear and noisy operation.
2. Check the generator connections. Generator terminal 51 must be connected to the generator regulator terminal 51 and the generator terminal 67 to the regulator terminal 67. Switch off all lights and accessories and disconnect the cables from the generator terminals 67 and 51. Connect the two terminals with a short length of wire. Run the engine at normal idling speed and clip the negative lead of a 0-20 volt moving coil meter to one generator terminal and the other lead to a good earth on the generator body. Gradually increase the engine speed up to about 1000 rev/min. The voltmeter reading should rise steadily and without signs of fluctuation, but do not let it reach 20 volts and do not race the engine in an attempt to increase the reading.
3. If there is no reading check the brush gear. If the reading is about half to one volt the field winding may be faulty. If approximately four to five volts the armature may be faulty.
4. If the generator is in good order leave the temporary link in position between the terminals and restore the original connections correctly. Remove the terminal 51 from the regulator and connect the voltmeter between this lead and a good earth on the car. Run the engine as before. The reading should be the same as that measured directly on the generator. No reading indicates a break in the cable from the generator to regulator. Repeat the test on terminal 67. Finally, remove the temporary link from the generator. If the readings are correct, test the regulator as described in Section 11:5.