Wiring Questions

I'm rewiring the whole bike and although I'm not familiar with electrics it's coming along well with the exception of a few hurdles and unknowns. Any help clarifying the following

I have a Boyer and a Sparx 3 - Positive ground

1. On the Boyer, Where does the WHITE wire coming off of the black box go? (I'm assuming it connects to my ignition and then in turn also runs to the Positive terminal)

2.On the Sparx, Where does the BLACK wire coming off of the square finned metal box go? I'm assuming that it runs to the negative battery terminal.

3. What is the Blue cylinder and do I need it with the Sparx?

4. Just to confirm, Positive ground means that the positive terminal is ground to the frame, Correct?

As you can tell by my questions, I'm very new to electrics, but if I can confirm the above I think I"ll be up an running pretty quick.

Any help is appreciated!!!

Thanks
Brian

Yes, positive ground means the positive battery terminal is grounded. Electrical components don't care which side is grounded, only that they have the correct polarity, if they are polarity sensitive. Most polarity sensitive components are plainly marked for polarity. Bulbs, switches, horns and most relays work with either polarity. Electronic ignitions, LEDs and diodes are definitely polarity sensitive. As for ground itself, think of it as another conductor (wire).

If you search the forum, you'll find a lot of info on the "blue can.' In general, you don't need it if you are running a battery. Apparently it was intended to provide a voltage sump if the battery was removed for racing. Do a search on '2MC' and you'll get all the info that you need.

I've answered 1 & 2 here: sparx-wiring-trouble-t3704.html Please try not to start multiple topics on the same subject, (one post deleted) - thanks.



3. The Blue cylinder is probably the Lucas 2MC emergency start capacitor that allows a bike with a flat battery to be started using power from the alternator rather than the battery, and it is intended to be used with the original points ignition, so it may or may not work well with a Boyer (or other) electronic ignition depending on the condition of the 2MC and the amount of alternator output at kickstarting speed? Provided the bike's battery is kept fully charged then the 2MC isn't entirely necessary.

4. Yes, positive ground (or earth) means the battery positive terminal is connected to the frame and/or harness return wires.
Electronics and certain items such as ignition coils need to be connected correctly with regard to the system's polarity.

Thank You so much for the clarity - this really has helped sort it out -

You wrote "Connect the White Boyer box wire to the Negative ignition circuit wire from the ignition kill switch"

I'm not clear on what that means exactly. Do you mean make a connection from the third ignition wire and then also run a wire to the negative terminal on the battery?

I wish I could read these wiring diagrams but I get so confused looking at it. This is really the last hurdle and the rest is just making good connections with the wires that I bought.

PalmerNorton said:

Thank You so much for the clarity - this really has helped sort it out -

You wrote "Connect the White Boyer box wire to the Negative ignition circuit wire from the ignition kill switch"

I'm not clear on what that means exactly. Do you mean make a connection from the third ignition wire and then also run a wire to the negative terminal on the battery?

I wish I could read these wiring diagrams but I get so confused looking at it. This is really the last hurdle and the rest is just making good connections with the wires that I bought.

Click to expand...

Here's a diagram of a Boyer with wiring colours as they should be for +Pos earth, it might be easier to understand when looking at it in colour. I have also a -Neg earth one too if you need a copy.
Robert

PalmerNorton said:

You wrote "Connect the White Boyer box wire to the Negative ignition circuit wire from the ignition kill switch"

I'm not clear on what that means exactly. Do you mean make a connection from the third ignition wire and then also run a wire to the negative terminal on the battery?

Click to expand...

No, there's no third wire connected to the battery.

So for positive ground...

You need a wire running between the ignition switch (terminal 2) and the handlebar ignition kill switch button to feed power from the battery (negative).

Then a wire from the kill switch button connects to the Boyer box White wire, and that's it. The Red box (positive) should then go to any good ground point, and you can do this via coil 2