Question about 1979 Harley Davidson XLH 1000 Sportster
Posted by Anonymous on
With the battery fully charged and the motorcycle running at idle, you should get 14V at the headlight terminals with headlight disconnected and headlight switch on (if yours has a headlight switch). When you rev the engine, voltage should not vary at all. If you do not get 13.5-14V at the headlight terminals, or if voltage varies more than 1V or exceeds 14.2V, replace the voltage regulator. (They typically only last a few years.)
Posted on May 21, 2015
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Posted on Jan 02, 2017
ok youve done alot great job, now trace until you get voltage. follow that wire back until you get voltage in other words. if you have any kind of diagram your problems solution is sooo simple.
i am a technician btw.
Posted on Jul 12, 2009
IT IS YOUR IGNITION MODULE. Drill out the rivits and remove the plate that shows the 5 speed. Then pull out the inner plate and there is the module. Its like 200 bucks but worth it. Then under the bike, there is a plug. Un plug it and cut the cable. Save the pin out on the plug so you can match the new one up. Then reverse the removal for the install and turn the ignition on. You should see a red blinking light on the new module. It will start and you will see a solid red LED. Button it up however you want, just make sure its tight and right.;
Posted on Aug 31, 2009
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.
Posted on Sep 24, 2009
To test the charging system, first you need a fully charged battery in the bike. With a fully charged battery, start the bike. Using a DVOM (digital volt ohm meter) put the red lead of the meter to the positive battery post and the black lead to the negative post. Put the meter in DC volts, 50 volt range. Bring the engine to a high idle and you should read between 14.5 and 15.0 volts at the battery. If you read this much, your charging system is operating as it should. If not, procede to check your alternator output.
If not, look for the connector that connects the alternator to the voltage regulator. Disconnect the connector. Now, going into the connector on the alternator side (the wire that comes from the left side engine case) test the output of the alternator. Put your meter in AC volts, 50 volt range. Notice we're measuring AC voltage now. Put one lead of the meter to each of the pins in the plug. Since it's AC voltage, it make no difference which lead goes where. Now start the engine and bring it to a high idle. You should read somewhere around 25 volts or higher. If you read this much voltage, your stator is good and your regulator may be bad. If not, your rotor is most likely bad.
One reason for a regulator not working correctly is lose of a good ground. Take the regulator off the frame and put a "star washer" (serated lock washer) between the regulator and the frame and tighten the mounting bolts. This will restore the ground on the regulator. If this doesn't help, the regulator is probably bad.
Posted on May 31, 2010
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