Amazon: bass wiring harness Bass Wiring Harness Prewired Kit for Precision Bass Guitar 250K Pots 1 Volume 1 Tone Jack Pack of 2. 5.0 out of 5 stars 3. $29 $ 29. 99. $1 shipping. Only 12 left in stock - order soon. 920D Custom PB Upgraded Replacement Wiring Harness for Fender Precision Style Bass. wiring harness | TalkBass SOLD Obsidian Wire - Solderless - P Bass, Precision Bass, Wiring Harness - Big Bold Tone! I just got this harness here on TB about a week ago. Super easy to install.