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cb500 dead short

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RGP750:
Hi All
I have a problem with my 72 500/4.Went out on it last year and everything perfect.
This year turn on ignition and dead short somewhere, frustrating nightmare.
Gradually disconnected areas of wiring, handlebar switches, rear light, horn regulator, etc and finally every connector in the headlight.
Thought it could be solenoid so replaced that, bypassed ignition switch , still doing it . any thoughts pleeeeeeeese!
Rich

McCabe-Thiele (Ted):
Difficult one to diagnose online.
So does it blow the fuse as soon as you switch the ignition on?
Have you done any work on the bike since you lay her up for the winter?
Is the regulator/ rectifier standard?

paul G:
I would start by disconnecting the red and white wires to the fuse box and rectifier and all the live feeds (anything with a black wire).
Reconnect the red and white wires one at a time and then the black wires one at a time until you find the problematic item section.
This will help to narrow it down.
You can also check the other side of the black wire connections for continuity to earth.

RGP750:
Not done any work since last ride.
I have disconnected every wire I can think of and it still blows as soon as I turn the key, or cut out the switch and " hot wire-"
If I got to the situation when the fuse didn't blow I could start adding wires until it went again but not there yet.
What else can I disconnect?

Nurse Julie:
I had the same problem last year with my 500K1 Rich. Graham spent hours and hours trying to sort the problem, he checked and changed connectors and wires, he fitted new parts which may have been causing the issue, but still didn't find the problem. In the end I bought a new loom from Electrix World, he swapped the loom over and the problem was cured instantly and she's been tickity boo ever since. .

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