There's your problem right there. You need a TRS jack, with battery negative connected to the ring so it connects to system ground when you plug in a mono plug. Your current arrangement leaves the battery connected 24/7.
Thank you very much for letting me know.
I wonder if you know if I can use this jack from a different set of Alembic pickups I have (This other set has some strange gremlin noises so haven't been using in a few years).
This system, in the pic, has the built in connectors, instead of terminal screw in blocks that I've been using.
Or I can try to purchase just the proper TRS jack but am wondering if, other than the hot and ground wires definitely being needed, would a proper TRS input jack for these pickups also need these extra wires coming off it like in my other system, the one in the pic in my hand?
Hoping I could just connect hot and ground and be all set.
Thank you again for your help.
Maybe this TRS jack would work?
https://www.sweetwater.com/store/detail/PTT2--pure-tone-ptt2-pure-tone-stereo-output-jack-nickel