Basic wiring diagram

This is a basic wiring diagram I did for my café racer. Some of the components are not in the usual locations and I have put colors on wires for clarity. I did not add in the indicators (like flasher and high beam) but these can be added with ease. My alternator has a built in regulator so it is not shown. Also, the grounds for the headlight and the taillight are not shown until I figure out how to add a connection point to a component. If anyone is interested in the Visio file, just send me an e-mail and I will mail it to you. I am using Visio 2003.

Jean

Fuse is misplaced, the alternator current is not protected.

Doesn't power go to the Boyer box, not one of the coils?

grandpaul said:

Doesn't power go to the Boyer box, not one of the coils?

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The Boyer box appears to have a wire missing?

The system as drawn, shows negative earth/ground, therefore the power wire should connect to the no. 1 coil (+) terminal (or to a dual coil as shown) but the box Red wire should also connect to the power supply, and the Boyer diagrams shows the Red box wire connected to coil No. 1 (+) which appears to be the box wire missing from the diagram, the White box wire would connect to ground.

grandpaul said:

Fuse is misplaced, the alternator current is not protected.

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How so?

grandpaul said:

Doesn't power go to the Boyer box, not one of the coils?

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It does, I was going from "faulty" memory. Here is the corrected diagram...

Jean,

I don't think you want the power feed to the coil. The Boyer will feed the coil from the box. This power is switched in the box to energize and collapse the field in the coil.

The blue feed from the Boyer to the coil is correct, but the other terminal of the coil needs to be grounded.

I admire your skill in making this drawing. Whenever I try to draw something like this on the computer it looks like my 2 year old grandson did it. I usually give up and grab a piece of graph paper and ruler.

Ron L said:

Jean,

I don't think you want the power feed to the coil. The Boyer will feed the coil from the box. This power is switched in the box to energize and collapse the field in the coil.

The blue feed from the Boyer to the coil is correct, but the other terminal of the coil needs to be grounded.

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How Jean has shown the Boyer wiring is correct for negative/ground.

As both the Boyer box and coil(+) have positive connections when wired for negative ground (see my previous post above) .

The negative coil terminal shouldn't ground, it connects to the Black Boyer box wire, the Blue Boyer wire on the diagram would correctly be a Black wire, and the Black diagram wire would be the box White wire.

Here is the Boyer wiring as drawn from the Boyer instructions for positive earth, wire colour as per instruction sheet.

http://i411.photobucket.com/albums/pp19 ... wiring.jpg

NEGATIVE ground wiring diagram

I guess I should have put in big letters this is a NEGATIVE ground system. I almost never do my wiring jobs with positive ground since it is so opposite to every other vehicule on earth. I know why the brits went with a positive ground, but time has marched on and ignitions now work very well with negative grounds.

Jean

Re: NEGATIVE ground wiring diagram

Jeandr said:

I guess I should have put in big letters this is a NEGATIVE ground system. I almost never do my wiring jobs with positive ground since it is so opposite to every other vehicule on earth. I know why the brits went with a positive ground, but time has marched on and ignitions now work very well with negative grounds.

Jean

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Ok for negative the Boyer only change from diagram is the Red wire instead of going to earth attaches to the Yellow and White and the White goes to earth all other wires stay the same.

How Jean has shown the Boyer wiring is correct for negative/ground.

As both the Boyer box and coil(+) have positive connections when wired for negative ground (see my previous post above) .

The negative coil terminal shouldn't ground, it connects to the Black Boyer box wire, the Blue Boyer wire on the diagram would correctly be a Black wire, and the Black diagram wire would be the box White wire

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I apologize for the misinformation. I have never done an install on a negative ground system, but I see the logic now.

Re: NEGATIVE ground wiring diagram

rbt11548 said:

Jeandr said:

I guess I should have put in big letters this is a NEGATIVE ground system. I almost never do my wiring jobs with positive ground since it is so opposite to every other vehicule on earth. I know why the brits went with a positive ground, but time has marched on and ignitions now work very well with negative grounds.

Jean

Click to expand...

Ok for negative the Boyer only change from diagram is the Red wire instead of going to earth attaches to the Yellow and White and the White goes to earth all other wires stay the same.

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So you mean if the battery is grounded on the negative like it's supposed to be the RED boyer wire is attached to a yellow and white wire? Where does the yellow and white wire come from on the bike? I know that the WHITE boyer wire is changed from the igniton switch to the battery's negative post.

I also want to know how you can tell if the stator/flywheel has a built in regulator. And in the diagrams they show no rectifier.

Re: NEGATIVE ground wiring diagram

chopped850 said:

So you mean if the battery is grounded on the negative like it's supposed to be the RED boyer wire is attached to a yellow and white wire?

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The original Commando electrical system would have been wired positive ground (or positive earth = UK).
It is possible to convert the system to negative ground, and some owners do that as they prefer it, however your system as it is, is still wired positive ground, so the Boyer Red wire and coil(+) must connect to ground.

IF you convert the system to negative ground, you would wire the Boyer using the diagram for negative ground, but the rectifier and Zener would have to be removed, and a modern control box used instead.

chopped850 said:

Where does the yellow and white wire come from on the bike? I know that the WHITE boyer wire is changed from the igniton switch to the battery's negative post.

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Originally a White/Yellow ignition wire would have come from the kill switch, and it would have connected to the White Boyer box wire.
Your system has the Boyer connected directly to the ignition switch, as your bike does not have standard wiring.

chopped850 said:

I also want to know how you can tell if the stator/flywheel has a built in regulator. And in the diagrams they show no rectifier.

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Jeandr uses a completely different type of alternator, as he said: "My alternator has a built in regulator so it is not shown" so presumably the rectifier is also built in?.
Your alternator (rotor & stator) is probably the standard Lucas type, so it has the rectifier and Zener, both of which can be replaced with a modern control box that is both a rectifier and regulator.

Re: NEGATIVE ground wiring diagram

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chopped850 said:

Where does the yellow and white wire come from on the bike? I know that the WHITE boyer wire is changed from the igniton switch to the battery's negative post.

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Hi Chopped850,
Here is a drawing in colour of the Boyer wired for negative earth, it may help; it gives the positions of all wires as per instructions, as you said your wires are different but as long as you wire it as per dia your ignition will work.

http://i411.photobucket.com/albums/pp19 ... ingNEG.jpg

As L.A.B. says yu will need to put in a regulator & rectifier or a modern control box, the boxes are good as they can be wired + or - and do away with a lot of wiring, they are also neater and fit and forget.