slackjaw44
greasy summmbitch
can someone explain how electrical system works on the xs..ignition vs charging
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electrical question
- Thread starter slackjaw44
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CDNTX650
XS650 Guru
If you have points, the + side of the coil on the primary is always hot when the key is on, the - side it broken by the points....which causes the magnetic field to collapse in the primary of the coil inducing a voltage on the secondary which is high voltage and jumps the gap on your plugs....
Charging, as the rotor spins it generates a 3 phases of AC power (like the same kind of electricity a local powerplant generates only much less voltage on a smaller scale) those are then rectified over to DC with the RECTIFIER, then it is regulated to 14 volts or so with the voltage regulator to charge your battery. some one can explain how the excited field/voltage regulator works better than me i'm sure.
bike will run with no charging system connected as lng as you have a battery in....but not for long.
Charging, as the rotor spins it generates a 3 phases of AC power (like the same kind of electricity a local powerplant generates only much less voltage on a smaller scale) those are then rectified over to DC with the RECTIFIER, then it is regulated to 14 volts or so with the voltage regulator to charge your battery. some one can explain how the excited field/voltage regulator works better than me i'm sure.
bike will run with no charging system connected as lng as you have a battery in....but not for long.
Last edited:
It works best when it's "ignition PLUS charging".
Rather broad question, what's your problem bro?
Year of your bike would help, as both ignition and charging change through the years.
Go to tech, read the dedicated articles come back with rather more specific questions if you still have them.
On the field excited alternator, the 650 used two styles of regulators and rectifiers. I'll start with the early mechanical regulator and selenium rectifier.
When you turn the key on battery voltage is sent to the regulator on the brown wire. At the regulator if the battery voltage is below the preset voltage of 14.5 volts, and it will be at this point. The reg sends battery voltage to the brush on the green wire, then through the rotor and out the other brush and to ground at the stator and out the black wire to the harness ground.
With battery voltage fed to the rotor it develops a strong magnetic field around it and the stator.
Now when you start the engine the rotor starts to spin. As it spins the magnetic field excites the windings in the stator. This creates an AC voltage on the three white wires. This AC voltage is sent to the rectifier where it gets converted to DC voltage. This DC voltage is sent on the red wire to the battery and grounded on the black wire.
This charges the battery, when the battery voltage reaches the preset voltage of 14.5 volts the regulator shuts off the voltage to the rotor. No voltage = no magnetic field.
This lack of a magnetic field, the stator stop being excited, and voltage stops flowing.
Now as the bike runs it draws down the battery til the regulator senses the battery voltage drops below the preset voltage and turns the rotor back on. Thus starting the charge cycle again.
This on/off cycle happens hundreds of times a second.
The solid state combo reg/rec as used on the 80 up bikes does the same thing, but in a slightly different way. The solid state uses a transistor instead of a mechanical relay. The transistor can switch on/off much faster.
On the solid state reg/rec when you turn the key on battery voltage is sent on the brown wire to the regulator as a voltage sensor. It also sends voltage to the brush on a brown wire. At the brush voltage goes into the rotor, out the other brush on the green wire to the regulator. If the reg senses the battery voltage is low it turns on the transistor and voltage flows to ground, turning the rotor on. Now when the bike starts the rotor excites the stator making voltage as before and charges the battery. As the battery voltages rises and reaches 14.5 volts the reg turns the rotor off. This cycle using a solid state reg happens thousands of time a second. This maintains the battery at full charge better.
The ignition is as CDNTX650 describes it. On the TCI of the later years it works pretty much the same way as points, but uses transistors and a pickup on the stator to control the firing of the plugs.
On points, the cam turns the lobe that opens and closes the points. When you turn the key and kill switch on power goes through the coils and to the points. When the points are closed power flows through the coil creating a strong magnetic field. When the points open the power stops flowing and the magnetic field collapses and excites the secondary coils. There are many more secondary windings than primary windings. This create a very high voltage to make the plugs spark.
On the TCI instead of using a lobe on the cam to open and close points it uses A magnet in the rotor and two windings in the pickup. As the engine spins the magnet passes the pickups.The windings in the pickup creates a small voltage and sends it to the TCI box.
In the box it uses the voltage from the pickups to tell the position of the of the crank and the rpms it is turning. With this information the TCI box knows when to turn the coil on and off to fire the plugs.
The ignition draws it's power from the battery and the alternator charges the battery.
The ignition and alternator have no connection other than that.
So there is no ignition vs alternator. They both serve a purpose and both are needed.
When you turn the key on battery voltage is sent to the regulator on the brown wire. At the regulator if the battery voltage is below the preset voltage of 14.5 volts, and it will be at this point. The reg sends battery voltage to the brush on the green wire, then through the rotor and out the other brush and to ground at the stator and out the black wire to the harness ground.
With battery voltage fed to the rotor it develops a strong magnetic field around it and the stator.
Now when you start the engine the rotor starts to spin. As it spins the magnetic field excites the windings in the stator. This creates an AC voltage on the three white wires. This AC voltage is sent to the rectifier where it gets converted to DC voltage. This DC voltage is sent on the red wire to the battery and grounded on the black wire.
This charges the battery, when the battery voltage reaches the preset voltage of 14.5 volts the regulator shuts off the voltage to the rotor. No voltage = no magnetic field.
This lack of a magnetic field, the stator stop being excited, and voltage stops flowing.
Now as the bike runs it draws down the battery til the regulator senses the battery voltage drops below the preset voltage and turns the rotor back on. Thus starting the charge cycle again.
This on/off cycle happens hundreds of times a second.
The solid state combo reg/rec as used on the 80 up bikes does the same thing, but in a slightly different way. The solid state uses a transistor instead of a mechanical relay. The transistor can switch on/off much faster.
On the solid state reg/rec when you turn the key on battery voltage is sent on the brown wire to the regulator as a voltage sensor. It also sends voltage to the brush on a brown wire. At the brush voltage goes into the rotor, out the other brush on the green wire to the regulator. If the reg senses the battery voltage is low it turns on the transistor and voltage flows to ground, turning the rotor on. Now when the bike starts the rotor excites the stator making voltage as before and charges the battery. As the battery voltages rises and reaches 14.5 volts the reg turns the rotor off. This cycle using a solid state reg happens thousands of time a second. This maintains the battery at full charge better.
The ignition is as CDNTX650 describes it. On the TCI of the later years it works pretty much the same way as points, but uses transistors and a pickup on the stator to control the firing of the plugs.
On points, the cam turns the lobe that opens and closes the points. When you turn the key and kill switch on power goes through the coils and to the points. When the points are closed power flows through the coil creating a strong magnetic field. When the points open the power stops flowing and the magnetic field collapses and excites the secondary coils. There are many more secondary windings than primary windings. This create a very high voltage to make the plugs spark.
On the TCI instead of using a lobe on the cam to open and close points it uses A magnet in the rotor and two windings in the pickup. As the engine spins the magnet passes the pickups.The windings in the pickup creates a small voltage and sends it to the TCI box.
In the box it uses the voltage from the pickups to tell the position of the of the crank and the rpms it is turning. With this information the TCI box knows when to turn the coil on and off to fire the plugs.
The ignition draws it's power from the battery and the alternator charges the battery.
The ignition and alternator have no connection other than that.
So there is no ignition vs alternator. They both serve a purpose and both are needed.
