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First - just purchased my 1976 CB750k 2 days ago - so I'm VERY green yet.
Problem: Nothing (electrical) is working.
I fixed the wiring to the headlight last night, in doing so drained the battery to where the starter didn't have enough juice to function. Kickstarted it this morning, went on a short ride (less then 3 miles) came home, shut the bike off and put it on the charger (12v 2amp). Came back to the bike a couple hours later, and nothin. No lights no starter, nothin.
Checked the battery voltage - 12.5ish. Have power going to the starter relay (battery cables are good). I have power at the key (red wire), but as soon as I turn the key to run - nothin. Even the red wire goes dead.
Tried kicking it to make 100% sure of no spark. I'm at a loss. Apparently staring at it isn't fixing the problem, I've pored over the electrical diagrams, but I don't even know were to start.
Not a good way to start life with my new money pit...
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Administrator
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Welcome to the forum. The first thing I would check is the fuse block. they were made pretty cheap, and the connections are not very good. Check both side of the fuse, for voltage. I always replace the fuse block with the wire in blade type fuse holders. never had a problem with them. Then I would check the ignition switch. These also go bad often. vintagecb750.com , and tazclassicmotorsports.com both have replacements.
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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I checked the fuse block, but will do so again more thoroughly.
Is the ignition switch the key? The wiring diagrams make it seem as tho its something/somewhere else. (I think they refer to the key switch as the "combination switch")
On May 14, 2011 10:56 PM, "TOOLS1 [via Honda CB750'S]" < [hidden email]> wrote:
> > > Welcome to the forum. The first thing I would check is the fuse block. they > were made pretty cheap, and the connections are not very good. Check both > side of the fuse, for voltage. I always replace the fuse block with the wire
> in blade type fuse holders. never had a problem with them. Then I would > check the ignition switch. These also go bad often. vintagecb750.com , and > tazclassicmotorsports.com both have replacements.
> TOOLS > > ----- > 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. > _______________________________________________
> If you reply to this email, your message will be added to the discussion below: > http://honda-cb750-s.456789.n3.nabble.com/Need-Electrical-Help-tp2942419p2942576.html
> > To unsubscribe from Need Electrical Help!, visit
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Administrator
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Yes the thing you put the key in, is the ignition switch. It does take some time to figure out the wiring diagrams, but it is time well spent.
The connections in the back side of the fuse block are not very good, and can not carry the amps. they will heat up, and blow fuses. Some people will put in a breaker, or even use 3/16 machine screws instead of fuses.
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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I guess I'm confused on this part - wiring diagram shows the ignition switch has 2 wires, black and black/white. Combination switch has 4 wires red, black, brown, and brown/white - which is identical to my ignition switch...
I'm decently familiar with wiring diagrams, but this isn't adding up.
On May 14, 2011 11:12 PM, "TOOLS1 [via Honda CB750'S]" < [hidden email]> wrote:
> > > Yes the thing you put the key in, is the ignition switch. It does take some > time to figure out the wiring diagrams, but it is time well spent. > The connections in the back side of the fuse block are not very good, and
> can not carry the amps. they will heat up, and blow fuses. Some people will > put in a breaker, or even use 3/16 machine screws instead of fuses. > TOOLS > > ----- > 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. > _______________________________________________ > If you reply to this email, your message will be added to the discussion below:
> http://honda-cb750-s.456789.n3.nabble.com/Need-Electrical-Help-tp2942419p2942602.html> > To unsubscribe from Need Electrical Help!, visit
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Administrator
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I think the one confusing you is the on/off switch on the right handlebar control.
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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If your battery is muffed up with a dead cell it can cause the whole system too fail, I would start there if for no other reason than it probably needs replaced do too age anyways.
I'll believe that corporations are people when Texas executes one!
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I actually had the same issue my first season on my 750. Turned out to be a blown fuse. I overlooked it simply because the fuse appeared fine. The filament was good. I switched the main fuse with another and voila! Always check the simplest things first. And don't do what I did. Test the fuse, don't just look at it.
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