« Reply #2 on: February 08, 2012, 09:52:27 am »
The switch has two live tags so that additional items can be powered without being subject to the ignition being on. In most cases the tag has no use but if you wanted a radio, interior light or something you can attach it exclusive of the cars wiring loom - should carry an in line fuse as you cannot turn the current off. It is very useful when chasing wiring faults as it should be a known and convenient live to jump a suspect part of the loom. I have a length of wire with crocodile clips either end just for this task. Great for Schmitt tube looms that have been melted and throw up strange faults, for instance. Many good quality ignition switches have this double live tag arrangement.
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