Pre-Wired Guitar wiring harness | Full Jazzmaster kit | Right Handed


Order times
I usually make harnesses to order, due to the variety of spec options that could be chosen across the whole range. The turnaround time for a Jazzmaster harness order is around 3-5 working days depending on quantity of orders in at the time and your order will be updated accordingly when it is dispatched. This turnaround time doesn't include the transit time. Thanks for your patience whilst I get your harness made!

It's no secret that I love Jazzmasters. From the comfort of the offset body shape, to the intuitive vibrato and ultimately, the sound. So this harness was definitely driven by the passion I have for the Jazzmaster design!
Unfortunately due to an unreliable supply of some of the components I haven't been able to offer a full traditional JM harness for a while, but I have just received a back order of parts so have decided to offer these again to order! Only this time with some further spec choices to dial it in to your personal tastes.

Pot value options and treble bleed?
Traditionally, vintage (and some new vintage correct models) were supplied with 1MEG Linear taper volume pots in the lead circuit (whilst still having an audio taper pot in the tone position). So if you are looking for that real vintage spec, then I figured this would be a good option to now offer. 

I also offer it with the popular perhaps more modern-spec audio/logarithmic 1MEG lead circuit pots, this is perhaps the most popular choice for modern guitars as audio taper closer represents how the human ear responds to sound, in a logarithmic manner. But one thing I noticed with Jazzmasters is that due to their naturally bright tone, rolling off the 1MEG audio taper volume pot can naturally lose some of the brightness through the taper. So to help with this and retain the chime right through the pot sweep, I also now offer the option of a treble bleed cap too! This will help retain the otherwise 'lost' treble frequencies as the volume rolls down and puts it back into the signal helping maintain that JM chimey/bright character right down the volume pot. But as treble bleed caps aren't for everyone, it's available as an option with or without. I must admit though, 1MEG audio taper pots in a JM seem to really benefit from a treble bleed cap I personally think!

I wouldn't however recommend a treble bleed cap with a linear taper volume pot, I find that this often makes the volume pot sound more like an on/off and doesn't suit the configuration well personally. So rather than have any disappointment down the line, I don't offer a treble bleed cap as an option with the 1MEG LINEAR taper volume pot option. 

If you have chosen a different set of pickups, like humbuckers or P90s perhaps, or simply want to tame some of the top end brightness associated with Jazzmasters, then I also offer this harness with 550k pots too! These are audio taper only.

It has become a popular choice recently to install much lower value 275k pots in the lead circuit also. I have decided to list it as an option now after some feedback from a good customer whom ordered it with this spec and loved the results. 

I feel that this makes my traditional Jazzmaster wiring kit a great choice as you can choose the pot type and value/spec that suits your preferences, between vintage, modern, alternative pickup and personal tastes.

Cap value options
Similarly to the choices between pots, I also offer the choice of lead circuit tone capacitor value. Traditionally Jazzmasters with 1MEG lead circuit pots were paired with a .033uF tone capacitor. So if you're looking for traditional/vintage style specs, this may well be the choice for you and pairs very well with 1MEG pots. 
But if you are perhaps going for 550k or 275k pots, then you may find a .033uF will soften the top end too much or create a less gradual tone pot sweep, so I also offer a .022uF cap value. Simply put, a .022uF will sound a little brighter than a .033uF cap and is a very popular pairing for 550k pots or 275k pots (as well as a popular choice for humbuckers or P90s for example if your JM has alternative pickup types).

I have intended for my wiring harnesses to be as simple as possible to install to your Jazzmaster, as well as writing in depth fitting guides, how-to instructions documenting the step by step process as well as a simple to follow wiring diagram.
It will be a 'drop-in' install for USA spec Jazzmasters, but for far Eastern build models, or alternative brand replica models then it may require modification. The parts I use, in particular the pots, are CTS branded pots which are imperial measurements. If you're fitting this harness to a far east built variant for example such as a Squier or similar, then you may have to widen the holes in the control plate to accommodate for these imperial measurement pots. Or alternatively, purchase a new control plate that is already suited to the US spec components. 
For reference, the CTS pots I use in this harness have a shaft diameter of 9.52mm.
You may also require new control knobs to fit the CTS pot 'split shaft' spline diameter of 5.95mm with 24 splines (push fit style control knobs).
If you do require a US spec control plate or control knobs, we do carry a selection of popular options in stock and they can be viewed in the hardware & plastic hardware categories on the store.

The template board I make my harnesses on, was taken from measurements of a USA built Fender Jazzmaster. So here are some of the main centre to centre measurements between components to help ensure a good fit into your Jazzmaster. I do allow for some give in the wire lengths though to help with a comfortable fit -
Rhythm circuit slide switch (centre) to centre of rhythm circuit volume pot wheel - 40mm 
Centre to centre of rhythm circuit pot wheels - 45mm
Centre to centre of rhythm circuit bracket mounting screws - 67mm
(Wire routing follows standard Jazzmaster body cavities from rhythm circuit to lead circuit section)
Centre of 3 way toggle switch to master volume pot - 11.5cm
Centre of master volume pot to master tone pot - 5.2cm
Centre of master tone pot to jack socket - 6cm

- Choice of lead circuit pot values/specs:
CTS 450 Series 1MEG Audio taper (volume and tone)
CTS 1MEG Linear taper for Volume (with audio taper for tone)
CTS '450' Series 550k audio taper (Volume and tone)
CTS '450' Series 275k audio taper (volume and tone
- SoZo .033uF Mustard tone capacitor in the lead circuit (or choice of .022uF value)
- .022uF 'Yellow Mustard' type tone capacitor in the rhythm circuit
- Gavitt USA made multi coloured cloth covered 22AWG wire
- 20AWG Tinned copper ground
- Switchcraft right angle 3 way toggle switch
- Switchcraft on/on slide switch
- Right angle rhythm circuit mounting bracket
- 2x Roller wheel control knobs for ryhytm circuit
- 1x Alpha 1MEG mini pot
- 1x Alpha 50k mini pot
- Pure Tone multi contact jack socket
- Soldered using Rapid 22SWG lead-free solder