When adding an extra pickup in your guitar two things can happen. The coils can be electrically out of phase or magnetically out of phase. In either case there are a few things you can do to remedy the problem. You can carefully remove the bar magnet in your existing Melody Maker pickup and flip it over 180 degrees. When you look at the bottom of the pickup you will see the bar magnet within a nylon bobbin. The magnet is magnetized across the width or the 1/2 inch dimension, not the length or thickness. The magnet will usually have black lines on the north side of the magnet.. If the black lines can be seen on the exposed side of the magnet, pull the magnet out and flip over and put the black line side of the magnet back into the bobbin. Flipping the magnet over 180 degrees will magnetically reverse the phasing.

You can reverse the hookup wires from the pickup that are soldered to ground and to the hot contact. Reversing the two wires will electrically make the two pickups in phase. Reversing the magnet and wiring can be done to the newly added pickup and should be done with extreme care to avoid damage to the coils. Reversing either the magnet or wiring will make the two pickup compatible with each other. Magnets should not be reversed in pickups such as Fender bobbins where the coil is wound directly onto the magnets.