So I ended up taking my Squier "Deluxe" Strat and Fender Vintage Noiseless pickup set to the local Fender dealer, along with a copy of the updated wiring diagram Fender E-mailed me.
He just called me to tell me about a problem he thinks he's traced to the 5-way switch that came with the Squier.
He said he’s checked and double-checked the wiring, even going to far as to desolder the whole harness and re-solder it, but he’s getting no output when the bridge and neck pickups are selected alone (I guess that would be positions 1 and 5). He says he believes the bridge and neck pickups are working when they’re selected in combination with the middle pickup, because he’s getting three distinct tones when he checks out positions 2, 3, and 4.
So now he’s ordering a new 5-way switch for the guitar on the assumption that the old one is “burned out.” But I’m wondering if there’s any other problem that could be causing this, since the switch was working fine when I brought the guitar in, and I can't imagine the heat of soldering damaging a simple blade switch. Any chance this is a common problem with a known solution?
Thanks in advance for any advice!