Alternators W/Integral Regulator
Fig. 19 Alternator w/Integral Regulator Field Open Or Short Circuit Test:
1. Using a suitable ohmmeter, connect regulator A blade terminal with one probe and the regulator ``F'' screw head with the other probe, Fig. 19.
2. Spin the alternator pulley and note meter reading, then reverse probes and repeat step 1. In one probe direction ohmmeter reading should be between 2.2 and 100 ohms and may fluctuate while pulley is turning. In the other direction, reading should fluctuate between 2.2 and approximately 9 ohms.
3. An infinite reading, no meter movement, in one direction and approximately 9 ohms in the other, indicates an open brush lead, worn or stuck brushes, defective rotor or a loose regulator to brush holder attaching screw.
4. An ohmmeter reading less than 2.2 ohms in both directions indicates a shorted or defective regulator.
5. An ohmmeter reading significantly over 9 ohms in both directions indicates a defective regulator or loose ``F'' terminal screw.
6. Connect alternator rear housing with one ohmmeter probe and touch the other probe first to regulator ``A'' blade terminal and then to the regulator ``F'' screw head.
7. If ohmmeter reads less than infinite at either point, a grounded brush lead, grounded rotor or defective regulator is indicated.