Help with tele sound issue

[Mr. Air]

There's something wrong with my tele and due to my lack of tech skills I can't locate the problem, but I'm pretty sure it has to do with the bridge pickup or the wiring of the pickups. The guitar has a four way switch and in position 1(bridge) there's just a low thin weak sound comming through. It's almost the same in position 4 (birdge+neck series) all though there's a bit more volume. Position 3 (neck) sounds fine and there's plenty of sound from position 2 (bridge and neck in parallel), but the tone is very much like position 3 which got me thinking that the bridge might deliver next to nothing in this position.

So the question is: Is it the bridge pickup that's damaged? I find this hard to imagine since the guitar haven't taken any beating or nothing else that would cause the pickup to fail. Or is it the wiring? I took a look today and everything seems to be in place (maybe not the right place, but the guitar has worked before and I haven't done anything to the electronics since). Maybe there's something wrong with the pickup selector???

Have anyone experienced something similar or have a clue about what's wrong?

any help is much appreciated.

[BigB]

I think you mostly summarized the possible culprits given the symptom: wiring, selector, pickup. wrt/ wiring it can look ok and still be damaged but if it worked and you have not touch it in any way there's no much reason I can think of that would make it break. This leaves us with the switch - mechanical part, often used, so there might be something wrong here - or the pup. I once had a pup that stopped working due to a dead coil (well, not totally "stopped working" since it was a bucker but...), and it did work fine a few days before.  You can easily check the pup with a multimeter (DC resistance, should be somewhere between 6 and 10 KOhms for a Tele bridge). If the pup's ok then check what you get on the switch (in / out) in position 4 (bridge alone).

[Mr. Air]

Thanks for you answer BigB. Unfortunately I don't own a multimeter, but perhaps my dad has one or else I'll dig one up.

[FELINEGUITARS]

If bridge on it's own is weak and the position 4 which is the series connected coils is weak then it sounds like a problem with the pickup or it's connecting wires.
Could the earth wire have come adrift?
Could be a break in the coil but I hope not.