Question about Harley Davidson FXST Softail Standard Motorcycles

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Battery not charging on 1992 stcfx - FXST Softail Standard Harley Davidson Motorcycles

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To check the charging system, you need a DVOM (Digital Volt Ohm Meter). Make sure the battery is fully charged or you'll get a bad reading. With the battery fully charged, connect the meter "across" the battery but connecting the meter's red lead to the positive battery post and the black lead to the battery negative post. Put the meter's function selection switch in DC VOLTS, 50 VOLT RANGE. Start the engine and bring it to a high idle. Your meter should read 14.5 to 15.0 volts.

If it does not, you need to check the alternator output. Find the plug in the lower front of the engine case where the regulator wires plug into the engine. Unplug the plug and look into the engine side of the plug. There are two metal contacts inside the plug. These metal plugs are where we are going to put our meter probes to test the output. Put on probe on each metal plug. It makes no difference which probe goes where just don't let them touch the engine case or each other. Put the meter's function selector switch in AC VOLTS, 50 VOLT RANGE . Start the engine and bring it to a high idle. Touch the meter probes to the two metal plugs in the engine case. Your meter should read 30 volts or greater.

If the alternator does not read thirty volts, make sure you meter is in the AC VOLT scale and you've got good contact on the metal plugs in the engine. If you still don't read at least 30 volts, you stator is bad and must be replaced. If you 30 volts or more but you don't have the 14 volts at the battery, the regulator is probably bad. Make sure the regulator is grounded properly.

Good luck
Steve

Posted on Mar 18, 2011

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