CB550 Blowing main fuse... Help?

H

henndoe

New Member
I recently started having problems with my bike when the main fuse blew, so nothing was getting power. I though it was the battery so I ended up getting a new battery. When I discovered that the main fuse was blown, I replaced it with another 15a fuse. However this fuse also immediately blows as well. Does anyone know what causes this and how I can fix it?

Thanks!
 
Re: Re: CB550 Blowing main fuse... Help?

henndoe said:
I recently started having problems with my bike when the main fuse blew, so nothing was getting power. I though it was the battery so I ended up getting a new battery. When I discovered that the main fuse was blown, I replaced it with another 15a fuse. However this fuse also immediately blows as well. Does anyone know what causes this and how I can fix it?

Thanks!
Click to expand...

You have a short in your wiring somewhere - have you done any maintenance lately where you might have pinched a wire or not plugged a connector in all the way?

If nothing springs to mind then grab a multimeter , a pot of coffee, and head to the electrical section to read Sonreir's stickies on troubleshooting your electrical system.
 
Sounds like a rectifier issue you're having. Could be allowing excessive amps/volts to your battery, causing that fuse to pop.
 
If the fuse is blowing after riding a short time and the fuse is too hot to handle after it blows, could be simple corrosion on the fuse block clips or on some of the spade connectors. Make sure all the connections, including the clips for the other two fuses are super clean and polished.
 
I'd wager a pretty penny you've got a hot wire grounding to the frame somewhere.
 
dualitymike said:
If the fuse is blowing after riding a short time and the fuse is too hot to handle after it blows, could be simple corrosion on the fuse block clips or on some of the spade connectors. Make sure all the connections, including the clips for the other two fuses are super clean and polished.
Click to expand...

Hmmm it's more like

replace fuse, turn on ignition - and then the fuse instantly blows.

kinda tearing my hair out over this.
 
henndoe said:
Hmmm it's more like

replace fuse, turn on ignition - and then the fuse instantly blows.

kinda tearing my hair out over this.
Click to expand...
100 % it's a short to ground then. Check all your connections as something is loose and grounding out.
Unplug the regulator rectifier and see if it still blows as well.
 
SONICJK said:
100 % it's a short to ground then. Check all your connections as something is loose and grounding out.
Unplug the regulator rectifier and see if it still blows as well.
Click to expand...

After unplugging the rectifier/reg it still blows. So it's safe to assume its an exposed wire thats grounding out somewhere?

Thanks
 
Yep, exposed or pinched. It has to he a power wire, A pinched ground wont do it.
Just a SWAG but I would start at the tail lamp wiring that's under the seat or the headlamp. You are looking for something that has power when the key is turned to "on" position.
 
Could be any red or black wire touching the frame or ground.

Tip, buy some fuses, get the bike i a competely dark room. remove tank/seat and such.
Let someone turn the ignition and see where she sparks. Can save you HOURS of searching.
 
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