Upgrade your bass with a professionally assembled passive wiring harness that's ready to install right out of the box. Each harness is hand-wired by the experienced technicians at Fat Bass Tone using premium components selected for smooth operation, long-term reliability, and dependable performance.
Whether you're replacing a worn factory wiring harness, upgrading a production bass, or completing a custom build, this pre-wired assembly eliminates the time, frustration, and uncertainty of wiring a harness from scratch. All current versions now feature solderless pickup connections, making installation faster and easier than ever.
This listing is for a pre-wired passive bass wiring harness featuring independent Volume controls for each pickup and independent Tone controls for each pickup.
Please verify that your instrument has sufficient control cavity space and that this control layout is appropriate for your bass before ordering. If you have questions about compatibility, we're always happy to help before you purchase.
A wiring harness is only as good as the components that go into it. That's why every Fat Bass Tone harness is assembled using premium parts trusted by professional builders and repair technicians.
Each harness features Noble® 250K potentiometers for smooth, consistent control operation, genuine Sprague® Orange Drop® .047µF capacitors for reliable tone shaping, quality multi-strand wiring, and a Switchcraft® output jack for dependable long-term performance.
The Volume / Volume / Tone / Tone layout gives each pickup its own dedicated volume and tone control, allowing you to independently balance output levels and shape the tonal character of each pickup before blending them together. This versatile configuration offers maximum passive tonal flexibility while maintaining a straightforward, intuitive control layout.
Every harness is professionally assembled and tested before it leaves our shop.
The solderless pickup connections make installation significantly faster and easier than traditional wiring harnesses.
Simply mount the controls, connect your pickups using the solderless terminals, install the output jack, and you're ready to play. Whether you're upgrading an existing instrument or completing a custom build, this harness delivers professional results while saving valuable installation time.
At Fat Bass Tone, bass guitars aren't just another product category—they're our passion. We've helped tens of thousands of bass players, builders, and repair technicians upgrade, repair, and customize their instruments with carefully selected parts from the industry's leading manufacturers.
Whether you're restoring a vintage instrument, upgrading your favorite bass, or starting a custom build, we're here to help you choose the right components the first time.
Fat Bass Tone offers one of the largest selections of premium bass pickups, preamps, wiring harnesses, hardware, and upgrade electronics available. If you're looking for a different wiring configuration, a replacement harness, or another bass upgrade, send us a message. Our team is happy to help you find the right solution for your instrument.