Gerard:
The pickup selector switch has 4 positions: Neck pickup/both pickups/bridge pickup/mute. The earlier Series instruments are all set up to run with one pickup only when using the 1/4 jack. Both pickups will work when using the 5 pin connector and the power supply. These can easily be modified to run both pickups with the 1/4 plug. (A search around the site should find this. It has been posted several times - later model Series run both pickups through the 1/4 jack). However, you will soon discover that Series instruments, when run using the 1/4 jack, have a healthy appetite for batteries. Most people use the power supply.
Bill, tgo