Jazzmaster grounding

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zeppfan1
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Jazzmaster grounding

Post by zeppfan1 » Sun Apr 23, 2017 4:58 am

Hey all,
So I installed mastery posts on my JM. However, I forgot to solder the wire for the ground. The posts aren't coming out, save from a nuclear blast. Any suggestions on how I could ground the bridge? Also, do I need to shield the cavity and/or the pickguard? I'm installing wide range humbuckers. Any help/tips would be greatly appreciated.

https://www.thegearpage.net/board/index" onclick="window.open(this.href);return false; ... 384.64391/

https://www.thegearpage.net/board/index ... 1492952488" onclick="window.open(this.href);return false;

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theworkoffire
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Re: Jazzmaster grounding

Post by theworkoffire » Sun Apr 23, 2017 5:24 am

Unless it's already prepared (is that what the blue is around the holes?), with a new gold guard you'll need to grind the anodizing off where all the metal parts connect, to make sure there's electrical connectivity:

Something like this vintage Fender one:
Image

How I used to do mine:
Image
Image

No need for shielding on the guard that way, but you should double-check everything with a multimeter for connectivity.

And yes, you'll need to shield the cavities and ground them to the guard/jack sleeve.

For the thimbles - you should be able to wrap a thin wire around one and trap it under a bare patch on the underside of the guard - you can see this patch prepared on the one I was doing above.

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Re: Jazzmaster grounding

Post by _nash » Sun Apr 23, 2017 7:44 am

I can't see the first link.
What kind of JM is it? Is there a ground to the vibrato plate? If so, no need to ground the bridge separately.

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zeppfan1
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Re: Jazzmaster grounding

Post by zeppfan1 » Sun Apr 23, 2017 11:00 am

It's a 60s roadworn.

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MuscleDad420
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Re: Jazzmaster grounding

Post by MuscleDad420 » Wed Apr 26, 2017 3:55 am

I encountered a similar issue with a CPJM a client installed a Mastery bridge into himself. For whatever reason the grounding continuity from the Mastery bridge thimbles was intermittent and did not conduct throughout the entirety of the thimble, producing a crackling noise. Especially when the trem was used.

My fix was drilling a hole with a long necked bit from the trem cavity into the control cavity and grounding the strings from there. Fixed the issue and left no visible trace.

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