Searching for a Short

[Hoogah]

My engine cut out suddenly today, just as I was sitting, idling the motor to warm it up before a drive. No history of electrical problems. The fuse did its job (thank goodness), so obviously I have a short somewhere.

I could find no symptoms in my cursory look around (e.g. no smoke to be replaced in wires! ), so now I need to systematically trace the problem.

The only area that I might have had a suspicion about is the ignition switch, which sometimes wants to rotate with the key when I turn it on.

I do own a Multi Meter, as yet unused. That's about to change. Is there a commonly agreed order of things to check in this situation? Thanks in advance for any advice offered.