SOHC.co.uk Forums > CB500/550
cb500 dead short
Toko_Jo:
Are you using the correct size fuse and not a car type 25 or 30A? If a large fuse has been fitted at any time, a wire may have fried internally in the loom itself and melted the insulation of one of the black wires. Only a single fuse on those bikes which makes diagnosis hard. If you have isolated all of the black wires (and also the black/white one if the kill switch is in the 'run' position), I can only think it's a loom problem.
RGP750:
Brand new loom fitted last year when I gave it a tidy up .
Yes correct fuse fitted .
As I have said it ran perfectly last year and something has gone ary while standing .
Just don't know where to look now.
Nbefore getting silly and replacing everything again
Oddjob:
New loom? well I think we can discount that then, for the time being. It blows as soon as you turn the ignition switch? all black wires disconnected? You've hot wired it to isolate the ignition switch and it still blows? so not the ignition switch. I'd check the sub loom first Rich. It's one of the 500s major problems in that it only has one fuse, anything wrong and the whole bike dies, not a good idea. Check the wiring on the sub loom to see if any have shorted out. Disconnect every wire in the headlight first off. The reconnect systematically, do the indicators first, most of the problems seem to be caused by them in my experience.
Bryanj:
Have a good look at the loom under the tank by the coils, i have seen the loom melt there on the green wire if the main ground contact is not 100%
It melts inside the loom all the way along destroying other wires.
If thats ok first things i would disconnect are rectifier and regulator
Oddjob:
Good shout with the reg and rec Bryan, especially if Rich has had the side cover off, a lot trap wires putting it back on.
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