I need a wiring diagram for a 1981 Fender Squire P-bass with EMG Active pickups now in both the P spot and J spot.

hi big eric.
this is all i could find on the internet.
see if this link helps you out.
Wiring diagrams for pre wired active bass guitar with 2 pickups and 5...

Standard J-Bass wiring is parallel. Not series.
http://www.mojotone.com/support/Schematics-for-Pickups-and-Guitars/Jazz-Bass-Wiring-Diagram

To run the pickups in series, the ground of one pickup would feed into the hot of the next. That's not what comes from the factory.

You may need to adjust the placement of the pickups.

Not hard - just wire up one pickup and leave the other one alone. The active pickup will have wires that say "output + and - " - just use those to connect to the same place you would attach a passive pickup. Also, an active pickup will need space for a battery (9v). I weould consult EMG pickup installation for diagrams. You will also probably need to replace the guitar jack with a TRS, where the ring is a "killswitch" for the battery when the guitar is disconnected.

Try this diagram set: http://www.emgpickups.com/skin/frontend/emg-2013/default/pdfs/2-tw-2v-1t-only.pdf

Wiring diagrams are in the Support ssection on the Fender site.

There are various things that could be causing the hum, best to start out on the smallest thing and go from there, could be dust gettting inside the volume or tone pots, check the ground wire that is soldered under the bridge plate to make sure it has a good solder and is not loose, etc. if all else fails, a quick fix is to place black electrical tape across the pick-ups, this will knock out some of the hum and help ground the instrument somewhat.

That bass combines passive EMG pickups with an active preamp (which provides the bass and treble controls). Sounds like you are never getting the preamp to work, and if that is the case there could be numerous reasons...a dead battery...jack wiring that is broken (meaning the battery ground wire is not attached or is grounding out)...likely should see a tech, but that is a good sounding bass when working correctly.

Search this site for diagram matching your units resources of pots, switches, pickups, etc.

If your Bass has Active pickups then it will only work when there is a battery. It will not work without a battery. If you do not want the active pickups then you can have someone swap out your pickups for passive ones. In fact, you can probably get passive pickups for free in exchange for your fancy (expensive) active pickups. Good Luck

Thank you for your concern, but I took it to a guitar repairman,and the problem is solved. pmusso5