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  #11  
Old 26th May 2022
brucstoudt's Avatar
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it's been said here the generator won't need polarizing with an electronic voltage regulator.true or false?
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  #12  
Old 26th May 2022
Jaime1840 Jaime1840 is offline
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Quote:
Originally Posted by IXL2Relax View Post
Charging System - Main Circuit Breaker - Functioning - Safe Wiring

The Main CB has the battery positive voltage connected on the input side (Copper Terminal) and the Voltage Regulator (VR) positive output voltage connected on the output side (Silver Terminal). The output side of the Main Circuit Breaker (where the VR is connected) also is wired to the input connection of the Keyswitch. (This descripiton is related to the EVO models, but the functionality is the same for Ironhead models as well. Even if your Main CB is slightly different in appearance, it functions the same.)

Starting the Engine: Since the charging system does not produce any power until the engine is running, we need the battery to get the engine running. With the keyswitch on, power flows out of the battery, into the Copper terminal of the Main CB, out of the Silver terminal of the Main CB, thru the keyswitch, then thru the Ignition CB to the RUN switch. Power, thru the Ignition CB, is also sent to the controlled terminals of the Starter Relay. With the RUN switch ON, pressing the starter button will activate the Starter Relay to send battery power to activate the starter/solenoid.

ReCharging the Battery: Once the engine fires and is running, now the Voltage Regulator is producing power (voltage) that is more than the battery voltage (especially since the battery just used power to operate the starter motor). So, power will now flow out of the VR, into the Silver terminal of the CB, out of the Copper terminal of the CB, to the battery. This is how the charging system now recharges the battery back to full power. The power flows from the higher VR voltage back into the lower powered battery.

At the same time, when the engine is running and the VR is charging the battery, it also produces enough power to operate the rest of the electrical needs of the motorcycle. This VR power now takes over from the battery (which was used when the bike wasn't running) and is sent thru the keyswitch to be distributed thru the individualized CBs to the ignition circuit, lights circuit, accessories circuit, etc.

You should notice that in starting the engine, power flows one way thru the Main CB (Copper to Silver) and in recharging the battery the power will flow the opposite direction thru the CB (Silver to Copper). The circuit breaker, when not overloaded, functions as a simple piece of wire, allowing power flow either direction. Power will flow in the direction needed to equalize the voltage or feed the load, from high to low.

The charging function operates just like when you put an external charger on the battery. The positive wire on the charger is connected to the positive post on the battery (and negative to negative, grounded). Then power will flow from the charger to the battery to raise the voltage of the stored power in the battery.

Be sure that the battery wire is connected on one side of the Main CB while the VR & Keyswitch are connected on the other side. This arrangement prevents destructively high current flow (and potential fire) on the wiring in case the VR or Keyswitch develops an internal failure, like a short circuit to ground. Note that some HD wiring diagrams incorrectly show the VR connected to the battery side of the CB. If the bike is actualy wired that way from the factory, it should, for safety, be changed to the proper connection location.

When the battery is fully charged, it may have a voltage higher than expected. After a one hour resting period is the time to test the voltage to determine the ability of the battery to hold a charge. At that time it should still retain 12.7v - 13v DC for a full charge.


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Hey thanks for the explanation. If I understood correctly this is how I have to do the wiring:

https://postimg.cc/8ssdfR2Q
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  #13  
Old 27th May 2022
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Quote:
Originally Posted by Jaime1840 View Post
Hey thanks for the explanation. If I understood correctly this is how I have to do the wiring:
YES - The Voltage Regulator can be connected where the CB connects to the Keyswitch input or at the CB output --- As long as it is on the opposite side of the CB from the battery, then the CB will protect the wiring from an overload/short.

Most often it is connected at the CB output (usually minimizes wire length) - And, there are normally other fuses/cb's after the keyswitch. Do you have more than one circuit - like, an ignition circuit & a lights circuit? Each of those would typically have their own fuse/cb to protect the wiring at a lower amperage. For instance, typically, the MainCB would be 30amps and each of the other circuits would have a CB rated for 15amps. I don't know what electrical loads you are using on the bike. Are you running headlight, taillight, brake light, turn signals? Other accessories? Electronic or points ignition?

If the MainCB is the only CB used, I would want to test a 15amp CB for that just so it is low enough to pop off safely. Only raise it to 20amps if the current draw on your specific bike causes the 15amp CB to click on & off (overload).

But the VR wiring will function correctly as you have it diagramed if it is necessary to do that.

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Last edited by IXL2Relax; 27th May 2022 at 03:01..
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  #14  
Old 4 Weeks Ago
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brucstoudt, the 79-85 FSM recommends polarizing the generator and those years exclusively use electronic regulators. While that's not definitive, it's cheap insurance to polarize anyway IMO.
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thanks i don't have a newer FSM,mine ends with '69.i still polarize mostly because my bike doesn't have a battery.
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  #16  
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Quote:
Originally Posted by BigMek View Post
brucstoudt, the 79-85 FSM recommends polarizing the generator and those years exclusively use electronic regulators. While that's not definitive, it's cheap insurance to polarize anyway IMO.
Unless you do it wrong and burn the regulator...

If you have a working gen light it polarizes the gen every time you start it.
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