Repair Manuals > 10Si & 15Si Series Alternator Type 116 & 136 > Bench Check

10Si and 15Si Alternator Repair Manual

For 10Si and 15Si Series Alternators, Type 116 and 136

Alternator Repair

10Si and 15Si Type 116 and 136 Alternator Repair Instructions

Alternator Bench Check

Figure 16 - View Inside Frame

To check the alternator in a test stand, proceed as follows:

  1. Make connections as shown in Figure 16, except leave the carbon pile disconnected. IMPORTANT -- Ground polarity of battery and alternator must be the same. Use a fully charged battery, and a 10 ohm resistor rated at six watts or more between the alternator No. 1 terminal and the battery. The "R" terminal need not be used.
  2. Slowly increase the alternator speed and observe voltage.
  3. If the Voltage is uncontrolled with speed and increases above 15.5 volts on a 12-volt system, or 31 volts on a 24-volt system, test regulator with an approved regulator tester, and check field winding. Note: The battery must be fully charged when making this check.
  4. If voltage is below 15.5 volts on a 12-volt system, or 31 volts on a 24-volt system, connect the carbon pile as shown.
  5. Operate the alternator at moderate speed as required and adjust the carbon pile as required to obtain maximum current output.
  6. If output is within 10 amperes of rated output as stamped on alternator frame, alternator is good.
  7. If output is not within 10 amperes of rated output, keep battery loaded with carbon pile, and ground alternator field (Figure 5).
  8. Operate alternator at moderate speed and adjust carbon pile as required to obtain maximum output.
  9. If output is within 10 amperes of rated output, test regulator with an approved regulator tester, and check field winding.
  10. If output is not within 10 amperes of rated output, check the field winding, diode trio, rectifier bridge, and stator as previously covered.


« Page 6 Contents »