Question about 2000 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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Battery not charging

Battery does not charge off charging system could it be the charging system itself

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First, take the battery to an auto parts store and ask them to test the battery for you. Usually this is a free service. You don't want to tear your bike apart and spend a lot of money only to find that it was a bad battery all along so rule that out first.

Next, with a fully charged battery in the bike, connect a DVOM (digital volt ohm meter) to the battery. Connect the red meter lead to the positive post and the black meter lead to the negative post. Put the meter in DC volt, 20 volt or higher scale. Start the enigne and bring it to a high idle. Your meter should build up rather quickly to read, 14.5-14.8 volts or so.

In not, turn the engine off for the time being and look at the left front of the crankcase to find the alternator plug. Disconnect the plug and look at the connectors inside the case. There will be two metal connectors down inside the plug. Take your DVOM and put one lead into each metal connector making sure you don't touch the crankcase with the leads. It makes no difference which lead goes where as we'll be measuring alternating current. Put the meter in AC volts, 50 volt range. Make sure the meter is in AC voltage as the current produced by the alternator is alternating current, not direct current. Start the engine and bring it to a high idle. Your meter should read at least 30 volts or higher.

Do not allow the leads to touch the case. It may be better to get everything set up, then start the bike and stick the probes into the connectors. You don't want to short anything out.

Now, if your read the correct voltage across the battery, your charging system is fine. If you read 11 or less across the battery but good voltage at the engine case, your voltage regulator is probably bad. If you read low voltage at the engine connector, your stator is probably bad.

Good Luck

Posted on Jul 06, 2010


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