Help with Preamp and Pickup connection!

[Nandoguitar]

Hello,

I have a Music Man Sting Ray inspired bass and I have some upgrades planned. I bought an original Music Man active circuit with 3 bands of equalization and an apparently original Sterling humbucker pickup (photos below).

I found the preamp connection diagram with a single pickup, but my pickup does not have 2 wires as in the diagram, but rather 3 wires (red, black and green).

Please, how should I adapt this connection? I really need help. I'm afraid of connecting it wrong and damaging the preamp or pickup (I don't know if that's possible, but...)

Thanks!