Question about Harley Davidson FXSTS Springer Softail Motorcycles

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Battery not charging

1995 ultra classic

Posted by Anonymous on


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EVO Softail models are hard on batteries because of the vibration from solid mount engines. A lifetime of more than 3 years is remarkable. Aftermarket batteries for HD's are not a good value since they fail even earlier. The HD batteries are designed and built for the rigors of life in a Harley. Any auto parts store will test a battery for free.

Stock Harley charging systems don't last more than 10 years or 50,000 miles. If the charging system doesn't pass testing, then all 3 components (regulator, stator, rotor) should be replaced at the same time. A weak stator will burn up a regulator, a weak rotor won't build a strong output field, a weak regulator will burn up the stator. It sounds like an unnecessary expense, but it costs less to replace them all at once than 3 visits to a shop to get the problem fixed. This is what I recommended to my customers when I had a shop.

Posted on Apr 22, 2015

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Hi Anonymous, your bike is 10 years old how old is your battery? Before any proper electrical diagnosis can be made on your charging system your battery needs to be charged to at least 12.5 volts or higher. Make sure all battery cables and wires have a clean tight connection at the battery and the negative cable is securely grounded. The usual bad guy in this senario is the voltage regulator, remove and inspect for bad connections, cracks or swelling, burnt signs or smell, if it looks ok re-install it and with an ohm merter or test lite confim good ground with ground strap/wire and mounting is tight.Rremove voltage regulator plug at the front right hand side of the inner primary. With your test lite connected to ground touch the regulator pins, if the test lite glows replace the regulator.Then attach the ohm meter to ground with one lead and test stator pins they should both read infinity. Set the ohm meter to the RX1 scale and touch both stator pins with both leads, reading should be 0.1to0.2 ohms. Then set the meter to volts AC and fire up the bike and set the throttle for 2,000RPM meter should read 32 to 40 volts AC release throttle to an idle meter should read 16 to 20 volts AC at 1,000 RPM. Turn off engine and plug regulator back into stator set meter for at least the 20 volt scale DC and fire up the bike again voltage at battery should be 14.3 to 14.7 volts DC at 3,000 RPM if no luck then replace the component that did past it's test, either the voltage regulator or stator and or rotor if necessary. Good luck

Posted on Apr 22, 2015


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Posted on Jan 02, 2017

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check the solenoid on the starter. and all of the connections.

Posted on Oct 13, 2009

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