need help on j-retro installation!

e4t3n

New member
hi guys. its my first attempt installing a preamp and im having some problems here.. Anyway i managed to mount the thing and everything works well except for the blend knob, where there is no sound when i switch to the bridge pickups.

here are some details on the connections..
top grey wire: 1 to neutral, 1 to gnd
bottom grey wire: 1 to neck pu, 1 to bridge pu, 1 to gnd

also, upon dismounting my original preamp, there are 2 black wires that were connected to the mids knob. whats their purpose? do i need to link them to the j-ret?

really hope i can get some help here, esp those who have done this before! thanks
 
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