Long story short, looking for similar experiences to either confirm I'm crazy, or confirm I'm not crazy. I built a PJ. Passive Aero type 1 PJ set of pickups (Aero pickups are my all time favorite and I have them in 2 other basses that I'm very happy with). Bought a wiring harness, standard vol/vol/tone. 250k Noble pots, and a .047 orange drop cap. The pots are about 1/2 the diameter of CTS pots and the wires used to connect them are the smallest I've seen. The tone of the bass was terrible. Very very thin, no bottom and almost no mids. I chalked it up to the pickups and decided I would later put a preamp in to correct the problem but never got around to it. Yesterday, I swapped pickups in a passive jazz I have. It had quarter pounders in it and it sounded great. It's got a tubular shaped capacitor on it which led me to believe it was paper in oil. The tone also got very dark very quickly when adjusted, but with tone full up I would consider the bass to sound correct. I removed the quarter pounders and the wiring harness, and dropped in a set of Laklin/Hansen single coils and the same wiring harness I used from the PJ above thinking that the orange drop would give me more room to adjust the tone knob. The bass now sounds absolutely terrible. Very very thin, and absolutely no punch. Since the problem followed the wiring harness, it makes me wonder if I just have a crappy harness?? Is this even possible that a harness can rob tone this much?? I thought that most pots were pretty much the same as long as the value of the pot was equal, and that tone caps really didn't matter that much either. Is it possible that this harness is my issue? I purchased from a reputable online store that I won't name. I have bought many pickups and preamps and hardware from the before and I consider them honest and reliable. Happy New year and please let me know your thoughts.