2.5 mini speedo with indicators install DOHC

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2.5 mini speedo with indicators install DOHC

clintwillis
I have a 79 cb750k

I am having a lot of trouble finding the wiring diagram for the 2.5 mini speedo with indicators ... you can get it on dime city and I know a lot of people have this.

If ANYBODY can help me and point me in the right direction or give me some instruction on wiring it to the OEM electrical connector that would be great.

thanks
1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

slownugly007
Look up drag specialties 2.5 Speedo with indicator wiring diagram...you will need resistor to splice between the turn signals because there's only one indicator light...ive got the diagram somewhere, ill try to find it.
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Re: 2.5 mini speedo with indicators install DOHC

TOOLS1
Administrator
In reply to this post by clintwillis
Just download the factory service manual from the home page here, and look at the factory wiring diagram. Find the wires that went to the stock lights, and connect them to the new indicator lights. Also, you will not need a resistor. That has been taken care of in the stock turn signal switch.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Re: 2.5 mini speedo with indicators install DOHC

slownugly007
Tools, do the 79s have only one indicator stock?
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis
It has a huge speedo unit.  separate L and R indicators.
1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis
Thanks a lot tools, the downloaded manual is so hard to see but I am working on it.

Am I able to just wire together all the grounds from the mini speedo and tie it into the factory ground?
1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

TOOLS1
Administrator
It should only have one ground. However it could be tied into the factory ground wire, or just run to a ground.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis
I think there is a ground for every indicator?  All the -'s represent grounds am I correct?

Thanks for the help guys haha I spent hours trying to figure this out before asking.

Got the wiring diagram from DCC.

 

1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis
I already have a diode for the turn signal units.
1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis


Some of the indicator lights look like the negative ends are wired back into the connector.

Am I correct on that?
1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

sgtslag
Any negative (-) wire, is 'ground', on the bike.  The negative (-) terminal on the battery, is connected to the chassis, which is dubbed, 'ground'.  Yes, you can bundle all negative (-) wires, and then connect them to the chassis, or another ground wire (every connector introduces resistance, so connecting the bundle to the chassis, is the better option, introducing less resistance, but it is negligible, most of the time -- soldering is recommended, over wire nuts, and twisting the wires together and covering them with tape).  Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis
Thanks a lot.  I see on the stock diagram though that the positive ends of the oil light and the neutral light are receiving power from the same wire so should I wire both those wires together?

I also see that the negative ends seem to serve a purpose in and have their own connecting wires to the unit instead of actually just being ground into the green wire like most ...

I drew up this shitty diagram however I am not sure if I am right ... I have friends who have installed this speedo on pre DOHC cb750's and it was a LOT easier.  I can seem to get it to work properly.

1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis
This post was updated on .
little bit too small earlier.


Guess I should wire the green normally which grounds most to the + end of the speedo back light and then the negative ends to the green and white striped one which I have going into the + end now?

Shit is confusing im pretty new to electrical

This is the second diagram if I follow it more factory like i guess. I connected the green wire even though it seems to be grounding a lot of other wires to the + end of the back light, assuming this has something to do with high beams being on?  

thanks for the help fellas



1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

Lucky 1
In reply to this post by clintwillis
All of the wires with a black stripe are ground.
On a Roadstar Adventure.
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis
if anybody is ever curious about the 2.5 inch speedo and using it with a 79-82 DOHC CB750 here is an image that solves the problem.
1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

masiste
 Interesting.  

      Any pics of your bike and gauge cluster?  I will probably end up doing  this kind of work.  First got to get the front suspension components (getting RaceTech components fo the front fork) and after my wallet flattens I will start pilling up the pennies until I can get in shape to spend some more. But for sure it is in the plan.

     
750DOHC
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis

No pics my bike is still a work in progress and in pieces.  I have the aluminium bracket dime city sells and the mini speedo with indicators and mini tachometer.  I polished the bracket up nice though.  I am not using the oil light for the switch because of installing the mechanical gauge.  Might use a rear brake light indicator

sent from my mobile.

On Nov 8, 2012 2:18 AM, "jaimesix [via Honda CB750'S]" <[hidden email]> wrote:
 Interesting.  

      Any pics of your bike and gauge cluster?  I will probably end up doing  this kind of work.  First got to get the front suspension components (getting RaceTech components fo the front fork) and after my wallet flattens I will start pilling up the pennies until I can get in shape to spend some more. But for sure it is in the plan.

     
82 CB750F.  :)



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1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

clintwillis
racetech fork tubes and such?
1979 CB750K
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Re: 2.5 mini speedo with indicators install DOHC

masiste
Yes.

  http://www.racetech.com/


       
750DOHC
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Re: 2.5 mini speedo with indicators install DOHC

surfish95747
In reply to this post by clintwillis
Clint, I know you posted this a few years ago, but your diagram helped me understand these speedo wires. Thanks man.
1980 cb750k
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