Yes it is possible the alternator/stator is shorted. I'm not all that familliar with sportster electrical systems but here is the short circut test for a dyna. it should at the very least tell you if the stator is shorted. Stator Check 1. Turn ignition key switch OFF. 2. See Figure 1-18. Connect an ohmmeter. a. Disconnect voltage regulator connector from alternator stator wiring. b. Insert one ohmmeter lead into either stator socket. c. Attach the other lead to a suitable ground. 3. Test for continuity with ohmmeter set on the RX1 scale. a. A good stator will show no continuity (? ohms) across either stator socket. b. Any other reading indicates a grounded stator which must be replaced. 4. See Figure 1-19. Remove ground lead. Insert lead into the remaining stator socket. 5. Test for resistance with ohmmeter set on the RX1 scale. a. Resistance across the stator sockets should be 0.1- 0.2 ohms. b. If the resistance is lower, a short is indicated. The stator is damaged and must be replaced. c. If resistance is higher (OL on meter), an open is
indicated. Stator is damaged and must be replaced
Now I will not swear that the resistance numbers are correct for your sporty but I would think that the same applies, less resistance means a short.
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