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Old 11-05-2012, 03:06 PM   #1
kaneorsomething
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Grounding issues pt.2

Made a thread last week about the same problem, lots of noise that I believe is related to a grounding problem. The original post went as follows

"So I've been trying to record lately and notice a lot of signal noise. I did some experimenting, and noticed that when I touch my bridge pickup, the buzz increases significantly. If I touch my neck pickup, the buzz goes away. I can also negate the buzz by touching the metal part of my cable.

I recognise now that this is a grounding issue, but with the results that are being produced, what should I do to fix it. Is the neck pickup the problem, as touching it fixes the issue, or is the bridge pickup, as touching it makes the issue worse?

Thanks guys."

I'm now at home with my guitar and am looking at my guitar's pickup cavities. I did so with the intention of looking for a ground wire, but can't see one. I assume that all the wires are encased in the same casing (the pickups are stock on the guitar, epiphone dot).

This makes me wonder if the problem isn't in the wiring. I did change the pickup covers not long ago..Is there any way this is causing my issue? I googled around and ready about dry solder points. Any thoughts?
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Old 11-05-2012, 03:09 PM   #2
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What guitar is it? does it have single coils or HB's?
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Old 11-05-2012, 03:15 PM   #3
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They're humbuckers, it's an epiphone dot. I have it open right now, and when I touch the pole pieces on the bridge pickup the noise increases. On the front pickup it appears to make it quieter. I don't know much about electronics so I'm not sure what this implies.
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Old 11-05-2012, 03:19 PM   #4
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Oh, also if I connect a piece of solder from one of the pole pieces to the bridge, the noise does not increase when I touch the pole piece....

Is it possible my humbucker cover isn't properly connected to the bridge pickup, and that is causing grounding problems?


Edit: took off the humbucker cover...problem is still there. I guess it has to be grounding. I'm not sure how to ground a pickup with only one wire, though..
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Old 11-05-2012, 06:21 PM   #5
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Sounds like the bridge pickup isn't grounded. There are definitely 2 wires; one of them them might be in the form of a shield around the first wire.
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Old 11-05-2012, 06:36 PM   #6
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Quote:
Originally Posted by jthm_guitarist
Sounds like the bridge pickup isn't grounded. There are definitely 2 wires; one of them them might be in the form of a shield around the first wire.


I'll take a picture, give me a moment.
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Old 11-05-2012, 06:43 PM   #7
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Old 11-05-2012, 06:59 PM   #8
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Inside the "wire" there are 2 wires. At the other end in the control cavity one of them is supposed to be grounded. You need to be looking there, but since it's a semihollow guitar I wish you luck.
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Old 11-05-2012, 07:00 PM   #9
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Quote:
Originally Posted by jthm_guitarist
Inside the "wire" there are 2 wires. At the other end in the control cavity one of them is supposed to be grounded. You need to be looking there, but since it's a semihollow guitar I wish you luck.


So I'll have to remove the entire innards of the guitar. Goddamn. Thanks for your help.
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Old 11-09-2012, 02:06 PM   #10
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Okay, finally doing this job today. Could use some help however. Here's a picture.



A: Do you see anything wrong here?
B: If not, what should I be looking for. A black wire appears to be coming from the bridge and is (i believe) correctly soldered to one of the pots. The red wire is from the neck pickup, with another black wire coming from the bridge pickup. another pic:



this is where the wires converge.

To remind, the problem I have is (I think) grounding in (I think) the bridge pickup (black wire).
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Old 11-10-2012, 07:44 AM   #11
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Next time you take the electronics out, tie fishing line on the pots before you push them through the body. It is much easier to get them back in place when your finnished.

Now to your real issue. I would get a soldering iron and re solder every joint. Your pots don't look properly grounded, although the angles of the pictures aren't the best to see.

Also make sure the bridge is properly grounded to the back of your pots.
www.guitarelectronics.com has great free diagrams.
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