Newly installed bridge pickup not sounding right (Jeff Beck Strat)

Tried installing a Seymour Duncan JB jr in the bridge position. I did it the way I’ve seen online, soldering the black wire to the lug on the pickup selector area and then ground the Green/bare wires to the volume pot. The pickup technically works but it sounds super thin and when I roll the tone knob down it cuts the volume. What am I doing wrong?