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Author Topic: HELP! 72 CB500 stuck at side of highway, fuse just melted...  (Read 1315 times)

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Offline smileswithadimple

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Hi all lookin for some quick help, my bike just died on the side of the highway.  The plastic housing melted.  Its a 72 cb500.  It is a 20amp fuse in it.  Is that what's suppossed to be in there?
72 CB500/4

Offline GammaFlat

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #1 on: May 19, 2010, 05:33:24 AM »
I think 15 is the max you should have.  Did the fuse blow?  Could you get "cooled down" and get going?  You're probably getting the fuse housing hot for a number of reasons but one of them is how hard the fuse holder clamps down on the fuse.  Bend it a little (inward) so it clamps on the fuse harder and clean the surface where it contacts the fuse (maybe with a key).  You probably have other issues but the game now is to get to your destination safely without wrecking anything.  You have to somehow make sure the mangled fuse holder does not ground out.  Do you have any tools (10mm) to remove the fuse holder?

The same thing happened on my K7 and I just got it cooled down and replaced the fuse (mine did blow but I had a spare). 
K4 - hmmm.  after K6 is done. 
K6 - Get all the king's horse's and men
K7 - my 2nd love (did I say that?)
K8 - Prolly the next SOHC I have on the road
05 KLR650 - Don't knock 'em 'til you try 'em.  685 might be in order.

Offline smileswithadimple

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #2 on: May 19, 2010, 05:36:31 AM »
Fuse looks blown.  Looks moist inside, like condensation.  U think I can hardwire and go? Thanks a million for quick response!

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Offline asom

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #3 on: May 19, 2010, 05:39:03 AM »
don't leave the bike!
in case I forgot, it's a 78' CB750F

Bloody knuckles and all...

Offline asom

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #4 on: May 19, 2010, 05:40:11 AM »
good luck.
in case I forgot, it's a 78' CB750F

Bloody knuckles and all...

Offline smileswithadimple

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #5 on: May 19, 2010, 05:43:22 AM »
Yup its the fuse, I touch both wires and there's power.  So is it safe to ride 1 mile with hardwired?
72 CB500/4

Offline Spanner 1

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #6 on: May 19, 2010, 06:00:31 AM »
If you have to twist the two wires together that go to each side of the fuse except 'tease' out 4 of the strands on one wire and twist the end to the other wire.... the 4 strands only connected = 15/20A fuse, good luck......

Offline smileswithadimple

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #7 on: May 19, 2010, 06:26:34 AM »
Thanks spanner! Got the bike to walmart, so, do I need 15 or 20 fuse?
72 CB500/4

Offline GammaFlat

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #8 on: May 19, 2010, 06:39:40 AM »
15 is probably spec.  If you're trying to get home you might replace it with a 20 but expect to go back to 15 for a more permanent setup

buy a handful - you might not be done blowing fuses today
K4 - hmmm.  after K6 is done. 
K6 - Get all the king's horse's and men
K7 - my 2nd love (did I say that?)
K8 - Prolly the next SOHC I have on the road
05 KLR650 - Don't knock 'em 'til you try 'em.  685 might be in order.

Offline GammaFlat

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #9 on: May 19, 2010, 06:42:55 AM »
you might be able to prevent some of the heating by cleaning the surfaces that grab the fuse and bending them a bit so they have a tighter grip on the fuse.  Those two problems are probably causing resistance which his making heat, which is making more resistance, which then gets hotter, etc.  Do things to prevent the heat... less resistance... clean surfaces, tighter grip

Later, you can address the green wire to the frame which is often a problem.  Other issues are the connectors between then fuse holder and harness and then the engine and harness.
K4 - hmmm.  after K6 is done. 
K6 - Get all the king's horse's and men
K7 - my 2nd love (did I say that?)
K8 - Prolly the next SOHC I have on the road
05 KLR650 - Don't knock 'em 'til you try 'em.  685 might be in order.

Offline smileswithadimple

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #10 on: May 19, 2010, 06:43:13 AM »
Thanks all! I really appreciate it! I bought a bunch of 15's. Thx!
72 CB500/4

Offline oldhondarider

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #11 on: May 19, 2010, 07:21:10 AM »
I just jumped on here (west coast).....

Can I just jump in here and say... how awesome that tread was... members helping members....  now I don't want to get in to the whole "halmark moment" stuff....

just wanted to say that the quick help was very nice to see.
« Last Edit: May 19, 2010, 07:23:20 AM by oldhondarider »
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Offline flybox1

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #12 on: May 19, 2010, 07:26:23 AM »
You Meet the Nicest People on a Honda  8)
'78 750K (F3 engine) PD42b's -  modded stock airbox w/K&N  filter, #42/#120jets, 1 needle shim, Fuel screws @ 1 turn out. Wrapped 4-1 Kerker. ConeEngeering Quiet core slip on
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Offline smileswithadimple

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #13 on: May 19, 2010, 07:34:32 AM »
I could not agree more!!!  I super appreciate the help, getting me out of that jam.  I will be making a donation to the site tonight!  Thanks to all!!!
72 CB500/4

Offline westondc

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #14 on: May 19, 2010, 02:41:30 PM »
did you figure out the cause of the problem?
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Offline 333

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #15 on: May 19, 2010, 03:04:59 PM »
If you don't find the cause, you'll go through that pack of fuses real fast.  I  suggest checking the water in the battery first.  Then clean the battery cable ends, regardless of how clean they look.
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Offline smileswithadimple

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Re: HELP! 72 CB500 stuck at side of highway, fuse just melted...
« Reply #16 on: May 19, 2010, 05:01:07 PM »
Yeah I figured it out right when I pulled my side cover.  The fuse holder had bare wire exposed outside of the holder, and I think it vibrated loose and shorted.  I bought a pack of fuses in 15a and electric tape and wraped everything up.  Looks to be good as I got home ok and nothing felt warm.  I will change to an ATC fuse/holder soon though.  Again thanks for the help and support all!
72 CB500/4

 

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