Question about 1979 Harley Davidson XLH 1000 Sportster
Hi, I own a 1976 XLCH1000 and had a similar problem some years ago.
The dynamo must be energized correctly as if not it wouldn't work.
Disconnect the two wire on the dynamo.
Connect a volt meter from the armature connection to the bike frame, negative.
Start the bike up and on a fast tickover there should be 2 to 5 volts present. Momentarily connect, while still monitoring the voltage, a wire link from the field connection to the bikes frame (earth or negative of the battery). The voltage should shoot up to about 25 to 30 volts. If it does you have a good dynamo. If the dynamo is flashed the wrong way around then a negative voltage instead of a possitive voltage will be produced and damage the regulator if it is the electronic type, like on mine.
If the voltage is low, change the brushes and clean the commutator with some wet and dry paper scraping out between the segments to clear the dead carbon deposits. Don't forget the end bearings are "Oilite Bearings" Don't use grease a drop of 20-50 is fine.
Anywhere else in the world, we put voltage on to the field terminal to produce current at the armature, trust the Americans to be different!
Ride safe and loud pipes save lives!
Hope this solves your problem.
Posted on Nov 09, 2010
Take the band off and check the brushes and the commutator. How much voltage are you getting out of it. If your battery is fully charged, you won't get much current flow (amperage) out of it unless you load the generator with a "carbon pile" load tester. You can have voltage with no current flow. This is the principle that the "GEN" light works on. If you noticed, this light has no ground. You have a wire from the battery and a wire from the generator going to the light. As long as both voltages are equal, you have no current flow and the light is out. If one or the other voltages goes high, then you have current flow and the light glows.
Posted on Nov 09, 2010
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Posted on Jan 02, 2017
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