Generators & Regulators: Other Mitsubishi Galant IX

BELT TENSION

For belt tension, see ADJUSTMENTS .

Abnormal Waveforms

The size of the waveform patterns can differ greatly, depending on the adjustment of the variable knob on the oscilloscope. (Scheme 10)

Identification of abnormal waveforms is easier when there is a large output current (regulator is not operating). Waveforms can be observed when the headlights are illuminated.

Check the conditions of the generator malfunction light (illuminated/not illuminated) also, and carry out a total check.

Scheme 10

Measurement Method

Connect the oscilloscope special patterns pick-up to the generator B terminal. (Scheme 11)

Scheme 11

Standard Waveform

Note. The voltage waveform of the generator B terminal can undulate. This waveform is produced when the regulator operates according to fluctuations in the generator load (current), and is normal for the generator. If the ripple height is abnormally high (approximately 2V or more during idling), the wires between the generator B terminal and the battery have broken due to fuse blowing, etc. The generator is usually operating properly.

For standard waveform observation conditions (Scheme 12)

Scheme 12

BRUSH

1. Replace the brush is the brush protrusion length is below 0.08" (2 mm). (Scheme 13)
2. The brush can be removed by unsoldering the brush lead wire. (Scheme 14)
3. When installing a new brush, push the brush in to the brush holder, and solder the lead wire.

Scheme 13

Scheme 14

ROTOR

1. Check the continuity between the slip rings of the field coil. If the resistance value is not within 2-5ohm, replace the rotor. (Scheme 15)
2. Check the continuity between the slip ring and the core. If there is continuity, replace the rotor. (Scheme 16)

Scheme 15

Scheme 16

RECTIFIER

1. Check the continuity between the positive rectifier and the stator coil lead connection terminal with a tester. If there is continuity between the terminals, the diode is shorted, so replace the rectifier. (Scheme 17)
2. Check the continuity between the negative rectifier and the stator coil lead connection terminal with a tester. If there is continuity between the terminals, the diode is grounded, so replace the rectifier. (Scheme 18)
3. Check the continuity of the 3 diodes by connecting an ohmmeter to both ends of each diode. If there is continuity between the directions, or if there is no continuity, the diode is damaged, so replace the rectifier. (Scheme 19)

Scheme 17

Scheme 18

Scheme 19

STATOR

1. Check the continuity between the coil lead. If there is no continuity, replace the stator. (Scheme 20)
2. Check the continuity between the coil and the core. If there is continuity replace the stator. (Scheme 20)

Scheme 20

For generator removal and installation procedures (Scheme 21)or (Scheme 22).

Scheme 21

Scheme 22