SOURCE: check engine light acting up
The first thing I would check is the voltage output from the charging system. If the regulator isn’t regulating, the voltage will keep climbing as the engine speed increases. The electronics in the speedometer don’t work well at these high voltages. This would also explain the bright marker lamps. You should be able to see this with a simple voltmeter across the battery terminals.
SOURCE: harley davidson dyna low rider 2003 battery does not last when ri
I had this problem on my ultra clasic. I found a ground wire loose. you will have to locate all ground wires. and don,t frget the one on the battery.
SOURCE: how do you change a voltage regulator for a 2002
The voltage regulator bolts onto the frame, usually on the two downtubes of the front of the frame. It has one two pigtail and then a larger gauge single long wire. The pig tail plugs into the crankcase near the end of the oil filter. It may have a clip that holds it in. Loosen the nut on the clip and unplug the pigatail. Mount the new regulator to the frame where the old one came off. The regulator must have a good ground connection between it and the frame. Most mechanics put a "star type lockwasher" between the frame and the regulator. The teeth on the star lockwasher bite into the frame and the regulator insuring a good ground. The long wire is routed along the frame back and up to the positive side of the battery. There is no need to polarize anything, just put the new one on and that's it.
SOURCE: 1999 harley sportster will not charge the battery
To test the charging system, first you need a fully charged battery in the bike. With a fully charged battery, start the bike. Using a DVOM (digital volt ohm meter) put the red lead of the meter to the positive battery post and the black lead to the negative post. Put the meter in DC volts, 50 volt range. Bring the engine to a high idle and you should read between 14.5 and 15.0 volts at the battery. If you read this much, your charging system is operating as it should. If not, procede to check your alternator output.
If not, look for the connector that connects the alternator to the voltage regulator. Disconnect the connector. Now, going into the connector on the alternator side (the wire that comes from the left side engine case) test the output of the alternator. Put your meter in AC volts, 50 volt range. Notice we're measuring AC voltage now. Put one lead of the meter to each of the pins in the plug. Since it's AC voltage, it make no difference which lead goes where. Now start the engine and bring it to a high idle. You should read somewhere around 25 volts or higher. If you read this much voltage, your stator is good and your regulator may be bad. If not, your rotor is most likely bad.
One reason for a regulator not working correctly is lose of a good ground. Take the regulator off the frame and put a "star washer" (serated lock washer) between the regulator and the frame and tighten the mounting bolts. This will restore the ground on the regulator. If this doesn't help, the regulator is probably bad.
Good Luck
Steve
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