So I have what seems to me to be a wiring issue in my Classic 60s Jazz. I got it second hand, and noticed this immediately, but haven't gotten around to tinkering yet. When I turn both pickups up to full volume, they all the sudden turn really clanky sounding. This happens no matter what the tone control is set to. It's a huge transition, too. Like it goes from sweet Jazz bass tone immediately to clanky treble monster with no intermediate phase. So basically what I'm looking for is a pic or diagram of a correctly wired jazz bass so I can compare how mine is done. There are aftermarket pickups in mine, I'm kind of thinking that there was an accidental wiring mistake. Thanks!