Blown main fuse

[Splittie]

I own an 81 GS750L
I come to the GS gurus to ask the question...

What would be the reason for my main fuse to blow out as I am riding?
On my way to work, the bike lost all power. The main fuse had blown out.
The fuse had not blown out the center, but it seems as if it had gotten extremely hot and melted the end on the inside as there was a small 'ball' of what looks to be solder inside the fuse.
Will it be best to run a larger amp fuse?
Thanks for any help.

[Dave8338]

NOOOOO! If it is the stock amp fuse, larger will only create bigger problems further down the line in the harness. Clean up all the connections (and use dielectric grease) check the R/R output to the battery and report back. DO NOT just drop a larger fuse in there or we'll be reading a post that states: " Bike Melted Down...Now What ".

[SqDancerLynn1]

I would not put in a bigger fuse. Replace the fuse & check the charging system as a starting point.

[Splittie]

Any ideas why the center of the fuse isn't blowing??:-?

[Dave8338]

Any ideas why the center of the fuse isn't blowing??:-?

I'd be suspect of the fuse block. If there is more resistance on one end of the terminal than the other, there would be more heat created at that end. This may be the cause, though it is only speculation...

[bleeble]

I don't recall hearing about any laws of physics saying that fuses have to blow in the middle...

[psyguy]

I don't recall hearing about any laws of physics saying that fuses have to blow in the middle...

typically, the mid portion of the wire inside the fuse is a little thinner than at the ends

[bleeble]

typically, the mid portion of the wire inside the fuse is a little thinner than at the ends

True. But something hot enough to melt the end of the wire should have been hot enough to melt the endcap as all of the heat would have been transferred through it.

[mortation]

I had this problem. Swapped out the R/R and its all gone.

[Splittie]

I had this problem. Swapped out the R/R and its all gone.

Did you have any other problems along with it??
The reason I ask is that I currently keep my bike plugged into my battery tender at night since I have had to push start it a couple of times after I have started it 2-3 times during the day.
I haven't had the time to troubleshoot the charging system yet as I have been working from 6am-7pm and I dont want to start working on it and then not be able to complete it to ride to work the next day.
Thanks for the help.
Also, where did you purchase your R/R?

[mortation]

Did you have any other problems along with it??
The reason I ask is that I currently keep my bike plugged into my battery tender at night since I have had to push start it a couple of times after I have started it 2-3 times during the day.
I haven't had the time to troubleshoot the charging system yet as I have been working from 6am-7pm and I dont want to start working on it and then not be able to complete it to ride to work the next day.
Thanks for the help.
Also, where did you purchase your R/R?

That sounds really R/R related. Sounds like your battery is not charging. You "Should" go through the stator papers though to be sure as it COULD be the stator. If you got the extra dough and not the extra time replace the R/R if that don't work replace the stator. That was my plan but all I needed was the R/R

I got my R/R from Z1, it was cheap and bigger but not to big as to not fit where it goes. Lots of other people get theirs from a guy on here called Duunage (Spelling??)

[Splittie]

Thanks Mortation,
I will look at purchasing one.
I also want to do a 530 sprocket and chain conversion as my sprockets are worn causing my just purchased chain to go to crap.
It seems like this bike is going to be costing me a bit of money.
I'm kinda on the fence about getting all the parts for it when I have a cb500 and a cb750 in the garage that need a few parts also and my wife keeps telling me I have too many projects.

[rustybronco]

I'm kinda on the fence about getting all the parts for it when I have a cb500 and a cb750 in the garage that need a few parts also and my wife keeps telling me I have too many projects.

The answer to that is to say... uh-hu (yes) and keep on going.
and if she asks what does that mean, say yep your right honey... and keep on going.

[Splittie]

The answer to that is to say... uh-hu (yes) and keep on going.
and if she asks what does that mean, say yep your right honey... and keep on going.

I think she has wised up to those types of responses already.
It was probably after I bought the fourth bike that I started loosing my charm and she started to figure out something was going on.

[rustybronco]

so you know the magic number is three! (glad I'm at three)

on topic... r/r most likely the cause.