I replaced the regulator in Oct 2012 at 10,000 mils which repaired the problem. Now the charging system isn't working and the battery light stays steady on when reved and the return voltage across the battery is 12v, no charging. Is it the same problem or do I go deeper? Thanks
SOURCE: charging system problem
mattica,
it is very important to check and verify the AC voltage from the stator output. I don't know what your specific spec is off-hand. you can do this with a multi-meter at the ouput plug from the stator where it connects to the voltage regulator. A BAD stator will ruin a new voltage regulator until it is replaced. I just went through the same exact thing.
SOURCE: Voltage Regulator Problem?
u want to chec alternator as well-ther r test u can do so buy a clymer manual which r very detailed-iv seen hd books in library sec 629
SOURCE: which post is which on generator on a 1975 sportster?
the post should be the same as an original. The wires should be green and tan. Green wire goes to the post towards the front wheel and the tan to the post nearest the engine. Don't forget to "polarize" the generator before starting. procedure is in the service manual. Momentarily short between the battery positive post and the field terminal.
SOURCE: why is my 2006 street bob not charging
If the regulator was replaced and wasn't properly grounded it will not charge.
SOURCE: 1993 Harley Sportster 883 Batt.
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.
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