I need help with Stereo P-J wiring!

Have you considered adapting the Rickenbacker 4003 wiring diagram off their factory web site?

 

Rickenbacker provides schematics, so you'll need to learn how to read this:

http://rickenbacker.com/pdfs/19507.pdf

or just use this:

https://www.seymourduncan.com/wp-content/uploads/2016/05/Rick_Standard.pdf

add:

I doubt anyone would draw up a new diagram for this,
so you'll have to modify these to suit.

 

@mark Holiday ,
It seems you just described exactly what you need to do. What piece are you missing?

It's just two bog standard V/T circuits.

Thanks,
John

 

Use a Pbass diagram separately for each pickup. When you get to the output jack, both grounds to sleeve. One hot to tip, one to ring. I’d probably connect the split P pickup to tip so that, if you use a mono cable you’d still have that sound working.

 

If you want. There’s no absolute. 250K ohm tends to cut a bit more treble then 500 K ohm. If you don’t like the tone with 500K ohm volume pots, turn the volume or tone down slightly.

 

A couple of things I would consider if it were me doing this job.
1: I would probably wire the volumes in Jazz bass style, that is to say with the pickup going to the wiper of the volume pot;
2: I would link the tone controls up to the wiper side of the volume pots;
3: I would put in a toggle or push-pull on one of the controls to link both outputs back to the tip, in the (likely) event that I wanted to go back to a more traditional setup or get access to the blended tones (hence the Jazz wiring).

 

I meant to mention that and forgot. Like @SteveCS said, add a toggle or push/pull so both signals can go to tip on the output in case you’re somewhere you don’t have a cable with TRS plugs or don’t want the outputs separate. I guess I did mention the P pickup to tip but I was going to add the switch as another option and forgot. I’ll go be quiet now...