Question about 1993 Harley Davidson XLH Sportster 883

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1993 Harley Sportster 883 Batt. is tested and good, generator tested and good, regulator is tested and good, no drwa on batt with ignition off, Charging system putting out 13.5 VDC at 2000 rpm. At idle charging light comes on bright but goes out upon reving engine up, and the battery is discharging while engine is running. What am I missing??

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You've already spotted the problem. 13.5 volts is not enough to keep the battery charged. It will slowly lose it's charge. You should be charging at 14.5-15.0 volts.

Check your regulator output. Look just behind the base of the rear cylinder and you'll see the wires coming out of the primary that go to the regulator. There's a plug in the line somewhere. Unplug it. You'll be measuring the output of the alternator so you'll be dealing with the wire on the alternator end of the plug. There are two metal contacts in the plug. You'll need a DVOM (digital volt ohm meter) to do this test. Set the meter's function selector switch to AC VOLTS, 50 VOLTS or greater. Start the engine and bring it to a high idle. Insert one meter lead into each metal contact. It make no difference which lead goes where as you're measuring AC voltage. Your meter should read at least 25 volts or higher. If not, your stator is bad.

If you read 25 volts or more, your regulator needs replacing.

Good Luck
steve

BTW: Early 1984 was the last year for a generator on the Sportster. Late 1984 to present, the bikes have alternators on them. Much better than the old generators. Much better.

Posted on Sep 14, 2010

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Hi, Kirky and the usual suspects are:
1. Severely discharged or a damaged battery must have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
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For more information about your issue and valuable "FREE" downloads that you need for viewing or printing please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a wonderful day.
Bike shuts off while riding WTF Harley Davidson Forums
https://www.carlsalter.com/pdfs/harley-davidson-2010-sportster-service-manual.pdf
http://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
http://mybikemanuals.com/harley-davidson/2008-harley-davidson-owners-manuals
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