Vintage and Classic Hondas

Help with Fuse blowing

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DonMan900
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Help with Fuse blowing

DonMan900
I have a 75 cb750.  It only have the 1 15A main fuse.  My bike runs fine, but the fuse always goes when I turn on my taillight.  All the headlight and signals work fine prior to turning the tailight switch on.  Do I have a bad ground? Is it my taillight switch?  Where do I start to fix the problem?
TOOLS1
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Re: Help with Fuse blowing

TOOLS1
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I run a 20 amp circuit breaker on my bikes. What, you probably have is a short in one of your light wires, or the connection at the fuse holder is bad causing it to overheat, and blow the fuse. I also replace the fuse block with the wire in blade type fuse holders.
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)
Hellbilly429
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Re: Help with Fuse blowing

Hellbilly429
I know I was having the same problem when I first got the bike and realised someone put a 10amp fuse in the main fuse spot, I did some google-ing and found that there is supposed to be a 20amp fuse there, so I put one in it and it hasn't blown yet so hopefully thats all the problem is.
DonMan900
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Re: Help with Fuse blowing

DonMan900
In reply to this post by DonMan900
Thanks for replying,  I ran a 20 amp and it still blew.
Tools...My bike has a 3 fuse glass holder type.  A 5 amp, 7amp and 15Amp Main.  When I bought the bike from the PO it only was only running the 15Amp main fuse.  The other 2 holders were empty.  Would this be why the fuse is blowing when the taillight switch is turned on?  The added load of the taillight is overheating the fuse?  
TOOLS1
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Re: Help with Fuse blowing

TOOLS1
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Yes that could do it. Just cut the fuse box off, and wire in three of the blade type fuse holders. Use 7 amp, for the headlight, and 7 amp, for the taillight. Then get a 20 amp blade type circuit breaker, and no more problems.
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)
DonMan900
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Re: Help with Fuse blowing

DonMan900
Problem solved.  Replaced the fuse box with the blade type and breaker for the main.  Thanks for the much needed info!
Proshift
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Re: Help with Fuse blowing

Proshift
In reply to this post by TOOLS1
What type of circuit breaker did you guys use as a replacement? Is there a tutorial around showing the install?

Thanks!

Jay
TOOLS1
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Re: Help with Fuse blowing

TOOLS1
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Just go to any auto parts store, and ask for a wire in blade type fuse holder, and then ask for a blade type circuit breaker. You will need some wire connectors if you are doing all the fuses, and if you are doing the main on a DOHC, you will need two terminal ends with 1/4" holes.
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)
Re-run
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Re: Help with Fuse blowing

Re-run
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In reply to this post by DonMan900
The main fuse is supposed to be a 15 amp fuse. I don't know why a 20 would be used when it isn't needed. I run a 14 in my 78 and it has never blown. You have a creeping issue somewhere and it will get worse I think.
The ride IS the adventure. The destination is just to get gas!
Proshift
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Re: Help with Fuse blowing

Proshift
In reply to this post by TOOLS1
Thanks TOOLS!
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