Question about 2001 Harley Davidson XL 1200 C Sportster Custom

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I have a electrical dead short somewhere on the bike. It is a 2001 1200 Sportster. I have replaced the voltage regulator and the ignition switch. I have searched the wire connections around the fuse box, and the starter relay for possible problems but have not found any. No bare wires either, yet! Is it possible for the starter or the alternator to short out in such a manner? Any advice would be appreciated!

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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.

Posted on Apr 08, 2011


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1 Answer

Electrical short


Based on similr incidents, initial suspect would be the fuse box specifically the relays and diodes underneath. Next would be the starting relay, the ignition switch and the voltage regulator . These four (4) major components are a few of the electrical parts that are tied up directly to the battery even when the bike is off. Hence, a fault on any of them would disharge the battery.

However taking into account that most GSXR750 uses a 12V, 10AH battery, it would take a considerable load/short to discharge said battery in just 20 minutes, meaning whatever it is, it will heat up very noticeably. It would aid you in determining the probable partial short by feeling which of the above cited components heats up.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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