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The voltage regulator is bad or the Stator. Check to make sure you do not have something pulling power when the key is off.. Check the voltage should be 12.5 to 14.0, if it is lower then 12.5 with the engine running at idle. Check the stator for ground if the stator is grounding out bad Stator. If not, bad voltage regulator
A voltage regulator converts a/c volatge from the stator to dc voltage and regulates it down to under 15 volts. When they go bad they can over charge and take out a battery as well as not charge at all.
Check your stator first. That is the two wires coming out of the front of the case on the left side. With the bike running it should read about 18VAC. The two wires go directly to your regulator. Check the output of the regulator. You can do this at the battery. A charged battery should read between 12-13VDC (bike not running). Start the bike. Check for DC voltage at the battery again. It should read 14-14.5VDC. If you are only getting battery voltage with the bike running (1500-2000RPM) and the stator (rotating assembly) is putting out 18VAC +or- 1VAC your regulator is bad.
Unplug your voltage regulator at the front of the crankcase on the primary side. Use a multimeter set to "AC", by inserting the probes into the two holes and rev your bike to about 2500rpm or so. You should get about a 40-60 volt reading. You should also check for a ground, by doing a continuity test, or use the OHM setting on your multimeter to make sure the stator is not grounding out. If everything is good there, and your not charging up, your regulator is bad.
Many reasons are possible. Bad battery or discharging due to a short in the wiring or bad voltage regulator or stator is bad. Just too name the most common.
You will need to go to a repair shop and have them test the charging system.
Bad voltage regulator
Might be a defective voltage regulator (not opening circuit on shut-down) Or a bad stator. (if the battery doesn't charge at all.) Or an electrical short.
how will I know my Voltage regulator is bad. I have replaced the starter and had the battery and alternator checked they are good. My car will start when it is colder outside but as the day gets hotter it will not start.. Can you help
You have burnt out your voltage regulator. I would put money on your stator being bad now too.
A bad voltage regulator can cause an overcharging condition. Check the wires going to the regulator for corrosion and make sure the regulator has a good ground.
The voltage regulator for the alternator is in the computer. If the voltage regulator in the computer does not work, you can add an external voltage regulator and then your battery will charge normally. Make sure to check the ground on the computer. If the ground is bad on the computer, then the computer will not regulate the voltage to the alternator properly.