Most 12 Volts
No
Usually 12 Volt
1998 1200 yamaha vmax
The voltage rectifier is on the left side of the motorcycle just in front of the rear tire.
A regulator is referring to a regulator rectifier which converts the ac voltage put out by the stator to dc voltage and regulates it to a consistent voltage usually 12-14 volts dc.
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.
To test a motorcycle stator, first, disconnect it from the motorcycle's electrical system. Use a multimeter to check the resistance between the stator's terminals; it should match the manufacturer's specifications. Next, test for shorts by measuring the resistance between each terminal and the stator's ground; there should be no continuity. Finally, perform a voltage output test by starting the engine and measuring AC voltage at the stator terminals; it should produce voltage within the specified range when revved.
Typically 14 to 14.5 volts assuming a fully ( or nearly) charged battery.
If both batteries are of the same voltage (12 or 6) yes, you can use the charger. make sure that they are of the same voltage.
Symptoms of a bad voltage regulator on a Road King may include inconsistent or fluctuating voltage readings on the dashboard, dim or flickering lights, and issues with starting the motorcycle. Additionally, the battery may frequently drain or fail to hold a charge, leading to electrical system malfunctions. If the motorcycle experiences electrical problems or the battery light remains illuminated, it may indicate a failing voltage regulator. Regularly checking these symptoms can help prevent further electrical issues.
Take a voltmeter and hook it up to the battery posts and read what the voltage is. It should be 12 volts or more. Now start the motorcycle and check the voltage, if it goes up, it's charging. If not, check the battery to make sure it is not dry.
Overcharging; most likely the altenator is at fault and supplying too high a voltage.