SOHC.co.uk Forums > CB500/550
cb500 dead short
McCabe-Thiele (Ted):
Firstly I am assuming that you did not disconnect the battery over winter & that as you describe it the bike was fine last year - nothing has changed as the bike has just stood unused - it just started to blow fuses when you turned the ignition on after the winter rest.
I'm racking my brains as to what could deteriorate as it has stood over the winter - it seems unlikely that a wire could chafe or that an alternator wire would somehow become disconnected and short as it has stood.
My only ever experiences of a similar type of problem was when a rectifier had rusted causing a short in the casing & when a regulator stuck - two separate episodes first one on a bike, the second on a car.
My suspicion is that if such a failure has blown a number of fuses it is likely that wiring in the loom has overheated leading to further dead short. I mention this as if something has caused the loom to fail replacing the loom could lead to another loom failure.
Not sure if it is possible that major internal battery cell failure could be a cause?
Might be worth checking the state/condition of the battery.
RGP750:
Thanks for your thoughts. Battery off over winter on optimiser.
Motobatt , seems fine.
I took the loom off last night and externally looks fine I assume I have to unwrap it to check every wire.
That's the bit I can't get my head around , it was running fine
paul G:
Why unwrap it just use a multimeter and the wiring diagram.
Toko_Jo:
--- Quote from: RGP750 on May 11, 2023, 07:12:01 AM ---Thanks for your thoughts. Battery off over winter on optimiser.
Motobatt , seems fine.
I took the loom off last night and externally looks fine I assume I have to unwrap it to check every wire.
That's the bit I can't get my head around , it was running fine
--- End quote ---
Like I said in my previous reply, do a continuity check between any black wires and green. When you do that flex the loom at the same time with the meter still connected to see if there is continuity at anytime.
Failing that, you could sent it to that nice chap Ash on here..pretty sure he could check it out...sure he wouldn't mind :)
Bryanj:
Mottobbattt, you didntt by chance fit it backwards, i ask as i know the labeling is not the best
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version