main fuse blowing

[Anonymous]

the battery on my biked died and i tried using a car to boost it. this resulted in a blown fuse and must have shorted something somewhere. now i have replaced the battery and fuse but the bike seems to be randomly blowing fuses. it seems to happen especially when shutting off the bike,(with the key or the kill switch) but not always.

[wayne cooper]

just a start

sounds like a short, hope you have a service manual. good place to start is with a good look at your wiring. look for any chafed wires.next place would be the wires inside your kill switch(look REAL close)i had problems in this area and the hole in the wire was so small that the tip of my multi meter would just enter.I don't know the history on your bike as to whether it has been stored properly over the years but as a rule of thumb I would take off anything needed to get at the entire harness and separate ALL conections and look for a hot spot or corrosion,while you are at it give them all a good cleaning-any electronic supply has spray on contact cleaner-it is scary how little corrosion is needed to screw up your electrics.hopefully something will show up before you get this far but as i mentioned clean all contacts (including engine grounds)as it might save future head aches.If you don't have a service manual- get one as you will need it to properly check the individual components.

[focus frenzy]

starting a bit while connected to a running car can fry the regulator/rectifier in a big way.
if it is blowing the fuse when you shut it off, that points to wards one or more blown rectifiers.
rectifiers are one way valves for electricity, they allow power to pass one way (from stator to regulator) but not the other way, (from battery through regulator to stator) (they use diods to do this)
if to much power is fed into system (car alternator is way more power full)
it will burn out the regulator and rectifiers.
you can jump from a car, you just can't have the car running when you do it.

using a multi-meter disconect your regulator/ rectifier and connect the possitive lead from the meter to the positive output from the R&R (red wire) and connect the meter ground to each input wire from the stator (stator needs to be disconnected also) you should not have any continuity.
some meters have setting for testing diods.

[my98xplorer]

I had this problem a while back. I could start the bike, but when i revved it up the main fuse would blow and the bike would shut down. I had to replace the regulator and now everything is fine! Good luck!

[KGB]

I blew my main fuse by putting in a high wtt headlight.
The 100W kinda worked, then i put in a 130W 8O
melted the fuse block........