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Offline thelowmax

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Common fuse issue?
« on: November 02, 2014, 10:08:02 PM »
So, I keep having issues with my 7k ignition I think (i have ordered a new one). I keep blowing the 15amp fuse. Then I noticed that the 15A holder seems to have melted a bit. So I removed the entire fuse box and replaced it with one from my other 7k. Then, I noticed that that fuse box was melted in the same place. Then I looked at my  3k, 6k and 8k. They all have some melting damage to the 15a fuse holder. Is this inherent in these electrical systems?
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'72 Amen Savior/'77 CB750K Chrome/Da Bhudda(project)
'73 CB750K Green/El Verde (beat)
'76 CB750K Red/The Cinnabomb (sweet)
'77 CB750K Black (frame and parts) CANNIBALIZED
'77 CB750K Dark Purpley/Scooty Puff, Jr. (la beast)
'78 CB750K Black (struggling) SOLD
'78 CB750K Blue Flake/CiocioSan (minty)
'81 CB750C Poiple/Barbie'sDreamMotorcycle SOLD (darnit!)
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Offline calj737

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Re: Common fuse issue?
« Reply #1 on: November 03, 2014, 03:47:45 AM »
It's a pretty good indication of too much amperage through that circuit. Corrosion, short, non-stock equipment, dodgy Ignition switch.... Limitless possibilities for where the problem is, but it's obviously a problem.

Checked out Hondaman's replacement fuse blocks and ignition components?
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Offline RevDoc

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Re: Common fuse issue?
« Reply #2 on: November 03, 2014, 06:43:02 AM »
Hi, Lowmax! Sounds like your problem might have the same root cause as one I was having with the glass 15a Buss fuse on my 550K popping at the end, not melting the link. Here is the explaination Mark Paris, aka Hondaman, offered. Put in his fuse block upgrade and no problems since!

Ah, the old melted fuse trick!


You may wish to get one of my ATC-style Fuseholders. The metal clips on the old fuseholders were plated with chromate, which had a 10-year lifespan. Today, your fuse clips are probably a dark brownish color, which is oxidized chromate: this is a good resistor, and it makes a real good heater, which heats up the fuses until they melt. Then they look like they blew. I make more fuseholders for 750/550 bikes than anything else these days!
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Offline Don R

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Re: Common fuse issue?
« Reply #3 on: November 03, 2014, 07:04:28 AM »
If you like wiring and fabricating you can make up your own or just pop one of his straight in.
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Offline thelowmax

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Re: Common fuse issue?
« Reply #4 on: November 06, 2014, 11:21:20 PM »
Quote from: RevDoc on November 03, 2014, 06:43:02 AM
Hi, Lowmax! Sounds like your problem might have the same root cause as one I was having with the glass 15a Buss fuse on my 550K popping at the end, not melting the link. Here is the explaination Mark Paris, aka Hondaman, offered. Put in his fuse block upgrade and no problems since!

Ah, the old melted fuse trick!


You may wish to get one of my ATC-style Fuseholders. The metal clips on the old fuseholders were plated with chromate, which had a 10-year lifespan. Today, your fuse clips are probably a dark brownish color, which is oxidized chromate: this is a good resistor, and it makes a real good heater, which heats up the fuses until they melt. Then they look like they blew. I make more fuseholders for 750/550 bikes than anything else these days!


Thanks.
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What am I doing and why am I doing it? Those are excellent questions.

'72 Amen Savior/'77 CB750K Chrome/Da Bhudda(project)
'73 CB750K Green/El Verde (beat)
'76 CB750K Red/The Cinnabomb (sweet)
'77 CB750K Black (frame and parts) CANNIBALIZED
'77 CB750K Dark Purpley/Scooty Puff, Jr. (la beast)
'78 CB750K Black (struggling) SOLD
'78 CB750K Blue Flake/CiocioSan (minty)
'81 CB750C Poiple/Barbie'sDreamMotorcycle SOLD (darnit!)
'89 Trek 21" 21 speed Green/YaBiatch (the wife)
Converse One Stars size 8.5 Black/Sneaks (suede)

Offline saavejo

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Re: Common fuse issue?
« Reply #5 on: January 21, 2015, 07:01:49 PM »
I have the same issue with my hondamatic 750, I have replaced 2 fuse boxes and still have the same issue.  Were you able to resolve this issues?  Thank you very much ;)
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