2 pickup selector switch problem

[Rogingat]

I am stumped! I just acquired a 25 year old Guild X-150D. It is great but I now have a problem. It has 2 humbuckers, 2 volume and 2 tone pots. When I select either pickup it works fine. When I select BOTH pickups (switch in centre position) only the bridge pickup plays. I have pulled out the switch, examined it and tested it with an ohmmeter. It tests fine on the meter. Both pickups connected. Any ideas?????

 

[VictorB]

Can we see a pic of how its wired?

 

[BGood]

I am stumped! I just acquired a 25 year old Guild X-150D. It is great but I now have a problem. It has 2 humbuckers, 2 volume and 2 tone pots. When I select either pickup it works fine. When I select BOTH pickups (switch in centre position) only the bridge pickup plays. I have pulled out the switch, examined it and tested it with an ohmmeter. It tests fine on the meter. Both pickups connected. Any ideas?????

Try spray cleaning the switch. A 25 year old switch might have oxydized or something. I would think it is only dirty. Deoxit is your friend for this.