Question about Harley Davidson XLH 1000 Sportster Motorcycles
You need to check the output of your alternator. Unplug the regulator from the wires that come from your alternator. Put your meter function switch in AC VOLTS, 50 VOLT range. Start the engine and bring it to a high idle. Insert the meter leads into the alternator side of the plug. It doesn't make any difference which lead goes to which contact because you're measuring AC voltage. You should be reading 25 volts or higher from your alternator.
If your alternator is putting out 25 volts or better, and your battery is fully charged but only reading 12.3 volts, then your regulator is probably bad. It should be reading 14.5 to 15.0 volts when checked with a fully charged battery.
Make sure the regulator is grounded well to the frame and all connections are tight and clean.
Posted on Oct 11, 2010
Testimonial: "thanks for info not had bike for to long , after takeing the seat off i can see that a gremlins done the wireing ."
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Posted on Jan 02, 2017
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