Just installed some new pickups in a Les Paul. I didn't know their origin so I had to guess at the connections (they are 4-wire).
Now I'm having issues with low volume and a bad screech when turned up. I wired a push/pull to split both of the pickups. It works, but the bridge pickup is split when it's up and the neck is split when it's down, which is curious because they are from the same company and I wired them identically.

Any ideas? The leads were short so I had to add a lot of wiring to lengthen them, might that cause lower output?