I don't agree. First isolate the wire, then find the short.
Reason why: now the short may be affecting just one wire, depending on the situation, more wires may become affected as well and then the search starts all over again.
I had two shorts in my 245, and both were - annoyingly - intermittent.
This meant trying to find them were an ordeal.
One short was caused by careless welding by a previous owner, part of the wiringloom had been fried in a partially obscured place. Despite symptoms in only one of the wires, several turned out to be affected.
The other intermittent short was harder to find, yet in plain sight after removal of some carpets and had been in the making since the car left the factory.
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