Seem to recall that this relationship caused a considerable delay on one of our 747 RR aircraft transitting through an airport somewhere in the South Pacific. At some time during the preflight, the skipper found that his navigation displays weren't working properly, so he called for the engineers. The engineers were scratching their heads for some time until one of them noticed that the Stby Ign Switch was in the wrong position. Apparently the F/O had left it in the wrong position after he had done his preflight checks (grin).
Now, apart from the Stby Power switch, it's the first thing we look at if the Captain's instruments aren't working properly.
Cheers.. .Q.