I recently got myself a Nordstrand MM4.2 to pair with an active Mojotone 2-Band Music Man Clone. This is my very first attempt to mod an electrical instrument, and I thought it would be so much easier than what it looks like. I followed the wiring diagram that came with but I'm not really sure where or what I messed up, so I thought I might ask for help here before I take any further action.
Here's what it looks like:
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Since I want it wired in parallel, I connected the red & black wires from the Nordstrand PU with the hot, and white/green/bare wires are soldered together to the ground. At first I tried to solder the ground on the backside of the volume pot but I horribly failed (hence the aftermath), so I took a washer to ground all the wires somewhere else since I thought it's a brilliant idea. The single green wire soldered to the washer (ground) is connected with the bridge, and the battery is connected once on the preamp (red) and once with the jack (black) as usual.
When I plug my bass in without a battery, I can somehow hear it making sound (I have to turn my volume knob all the way up and the amp about the halfway for it), but only when I'm touching the control plate with my hand. I guess this means my pickup is working fine, but why does it make sound only when my hand's put on the control plate?
When it's plugged in with a battery it's dead silent, except it does make some minimal static noise when I mess around with the volume and EQ. I can also hear the sound coming out of my amp when I tap the control plate or the bridge, but nothing on the pickup.
Now here's the thing. I don't own a multimeter so I can't troubleshoot anything on my circuit. I suspect it's either my volume pot I cooked while I desperately tried to ground everything on it, or maybe I forgot to ground somewhere. Grounding parts is also the thing I can't seem to understand at all, even after watching a handful of youtube tutorials.
So if you could tell what the problem might be, I would really appreciate your help. Thanks in advance!