GENERATOR SYMPTOM DIAGNOSIS
For charging circuit wiring diagram for generator connection see scheme 3 To avoid damage, always follow these precautions
| CAUTION | Do not mistake polarities of "IG" terminal and "L" terminal. Do not create a short circuit between "IG" and "L" terminals. Always connect these terminals through a lamp. Do not connect any load between "L" and "E". Trouble in charging system will show up as one or more of the following conditions: Faulty charge indicator light operation, undercharged battery as evidenced by slow cranking or indicator clear with red dot, and overcharged battery as evidenced by excessive spewing of electrolyte from vents. (Scheme 3) |
Scheme 3
No-Load Check
Note. Turn off switches of all accessories (wiper, heater etc.).
Run engine at idle up to 2000 RPM. Read meters. Amperage should be 10 amps (maximum). Voltage should be 14.4-15.0 volts at 68°F (20° C) for 70A alternator or 14.2-14.8 volts at 68°F (20° C) for 80A/105A alternators.
Note. Consideration should be taken that voltage will differ somewhat with regular case temperature. (Scheme 4)or (Scheme 5).
Scheme 4
Scheme 5
If voltage is higher than standard value, check ground of brushes. If the brushes are not grounded, replace IC regulator. If voltage is below or in standard value
- Run engine at 2000-2500 rpm soon after starting engine.
- Read maximum value on ammeter immediately. If current is less than 49A (70A model) or 56A (80A/105A model) repair or replace the generator (70A). Ground "F" terminal and start engine. Measure voltage at "B" terminal (80A/105A). (Scheme 6)
If voltage is higher than standard value, it is considered that generator itself is good but IC regulator has been damaged, replace IC regulator. If voltage is lower than standard value, generator itself has problem, check the generator (80A/105A).
