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powertwins
Joined: 11 Aug 2008
Posts: 9
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 Posted: Tue Aug 19, 2008 5:32 pm Post subject: need more help please |
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Ok so I put the ballast resistor in- great power to the coils. .....but power on both - and + terminals of the coils-not good. So I traced the negative lead from the right side coil to find that it just danglingat the other end in the frame area of the rear of the bike- If I ground the wire I get ground to the coils and spark- yay!
So my question is does anyone know where the white with black tracer wire connects to near the rear of the frame area. I cannot find ground splice near the back, its the wire that provides a ground to the coils
1971 norton commando 750 |
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iusedtolikehondas
Joined: 22 Jun 2008
Posts: 36
Location: napa ca
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| Posted: Tue Aug 19, 2008 6:35 pm Post subject: |
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is it a white wire with BLUE tracer? that's what my wiring diagram shows. if so, it comes from the coil and goes to the harness connectors, where it turns into a white/yellow wire.
hope this helps |
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norbsa48503
Joined: 07 Apr 2004
Posts: 995
Location: Flint, Michigan
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| Posted: Wed Aug 20, 2008 3:05 am Post subject: |
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| Maybe Black with a white tracer? As in Black with a yellow tracer they are the end of the points and have branches for the little can condensers. These cans have there own red ground wire. |
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L.A.B.
Moderator
Joined: 20 Nov 2004
Posts: 1848
Location: Norfolk, UK
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| Posted: Wed Aug 20, 2008 12:36 pm Post subject: Re: need more help please |
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| powertwins wrote: | So I traced the negative lead from the right side coil to find that it just danglingat the other end in the frame area of the rear of the bike- If I ground the wire I get ground to the coils and spark- yay!
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No negative wire should go be going directly to ground, as it should be (was originally) a positive ground electrical system, so I don't see how grounding a wire connected to one of the coils' negative terminals would give you sparks, as that would be a short circuit? |
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powertwins
Joined: 11 Aug 2008
Posts: 9
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| Posted: Wed Aug 20, 2008 4:16 pm Post subject: |
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I did not touch the wire to chassis ground, which you are right is powered, but I ground it at the negative battery terminal directly. It did have a healthy spark after that
-- also the wire is white with a black tracer coming off of both negative terminals of the coils. both look very factory |
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Ron L
Joined: 27 Feb 2004
Posts: 1101
Location: Ohio
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| Posted: Thu Aug 21, 2008 3:16 am Post subject: |
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Powertwins,
It's been a while since I ran points in a Commando, but if I recall correctly, doesn't the white/black wire run from the ballast resistor to the negative side of one coil and loop to the negative terminal of the other coil? The feed to the ballast resistor should be white with a blue tracer. |
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L.A.B.
Moderator
Joined: 20 Nov 2004
Posts: 1848
Location: Norfolk, UK
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| Posted: Thu Aug 21, 2008 10:04 am Post subject: |
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| Ron L wrote: | | It's been a while since I ran points in a Commando, but if I recall correctly, doesn't the white/black wire run from the ballast resistor to the negative side of one coil and loop to the negative terminal of the other coil? The feed to the ballast resistor should be white with a blue tracer. |
According to the wiring diagram, there's no colour change, it only shows White/Blue? Would the factory have put White/Black and Black/White (points wire) wires so close together, so they would be on opposite coil connections?
Anybody else have a White/Black ballast to coils wire?
Also that ballast to coils wire would be relatively short as the ballast is right next to the coils? As powertwins described it, his White/Black wire runs toward the rear of the frame?
A Lucas RITA AB11 electronic ignition would have had a White/Black negative coil wire - although the coils would have been connected in series to work with the RITA? So this wire could actually be a left-over from a previous RITA installation, where an owner has re-installed points ignition, but used some of the old RITA wiring? |
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powertwins
Joined: 11 Aug 2008
Posts: 9
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| Posted: Thu Aug 21, 2008 6:24 pm Post subject: |
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| Im not sure exactly, but i do know that 10 minutes ago the commando came to life for the first time(from what the previous owner told me) in 20 years!!!! sounded good idle was wayyy high and things were vibrating off the bike left and right. It did sound healthy, I ran it only for a minute in part because my fuel supply consist of a hose and small funnel ( i didn't want to put new alcohol enriched modern fuel into the fiberglass tank). So now complete tear down and cafe it out! |
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Norton Commando Forum by Corporate Pages Web hosting using phpbb
The Unapproachable Norton Commando
At the end of 1967 the Norton Commando was announced.
The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.
It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.
Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.
It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.
The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.
