Question about 2003 Harley Davidson FXDL Dyna Low Rider
The very first thing to do is to take the battery to an automotive parts house. Ask them to load test the battery for you. If the battery isn't up to par, it won't hold a charge.
Now, with a fully charged battery, connect a DVOM (digital volt ohm meter) to the battery. Red lead of the meter to the positive post, black meter lead to the negative post. Put the meter's function switch in "DC VOLTS, 20 VOLT or greater range". Start the bike and bring the engine to a high idle. The meter should build up rapidly to read between 14.5 and 15.0 volts. If it does not. Move on to the stator.
Down on the left side of the engine cases, find and unplug the plug for the voltage regulator. Look down into the plug in the engine case. You'll see to metal contacts. You are going to put your meter leads on these contacts. First, change the setting on your meter to "AC VOLTS, 50 VOLTS or greater". Start the engine and bring it to a high idle. Put one meter lead on each metal contact down in the plug. It make no difference which lead goes to which contact because we are measuring in AC voltage. Your meter should read at least 30 volts or more. If not, your stator is not up to snuff.
If your stator is putting out enough voltage and the battery is getting 14.5 volts or better, it would appear that your charging system is working as designed. Now, that doesn't mean that it is ALWAYS working as it should. I fought a charging system on a 1991 FXR once for months. It would do fine most of the time but every once in a while, the battery would be dead. Even after a good ride it would be dead. We never could "catch" the charging system messing up. The owner finally got disgusted and had me change the entire system, stator, rotor, and regulator. No more problems. I would guess that the stator or regulator had an intermittant short or open circuit in it somewhere. At any rate, the entire thing went into the recycle bin.
Posted on Aug 25, 2010
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Posted on Jan 02, 2017
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