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Yeah I had thought it sounds just like the switch. I had a similar case, where it sounded like it must be the ignition switch, (AND of course actually replaced it, although to my defense, I did some tests it and came up with the switch as the diagnosis), and it ended up being what I already mentioned, a loose screw on a bus bar under the fuse panel. Now it does seem to me that at some point they got rid of this system of attaching wires to the bus bars and went to more of a plug-in sort of connector, so if that is the case it blows my theory out of the water, or at least complicates it.
In the case I had it was malfunctioning turn signals. At least I didn't do what others would have which would have been to replace whatever module controls the signals, or the combination switch. I had a power problem right at the fusebox and looking at the diagram you would have sworn it had to the (common failure) ignition switch, but it wasn't, the problem was in the fusebox (or it could have been a wire, to test the wire I had to get under the fuse panel anyways, and went to pull the wire off the bottom of the fuse panel and found there was no resistance at all when I went to unscrew the screw). Again this was all after I had replaced the switch, so it was a hard lesson learned about jumping to conclusions and blaming the "failure du jour".
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