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Old 01-13-2013, 12:03 PM   #1
Manvydas
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Question Hi, need help. Bad grounding.

So, i have some problems with my new guitar. First of all it was little damaged then arrived, switch was broken but still work. One knob was broken. So, I fixed this little problems and start playing.... so much hummm... hum is gone then volume is at 10 and tone controls is 0, for all other settings it's very noisy, and noise level is higher with all setings going up. From first look all wiring is good, i don't have soldering equipment, but saw some video on YT. Wire from bridge is soldered with bridge tone control. Humming is over then u touch metal part on guitar, but not bridge, noise is gone if touch one (thing keeping stop bar, don't remember (LP style guitar)), for other no action. Sorry for bad English.

You would help me a lot.
Thanks.
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Old 01-13-2013, 12:12 PM   #2
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do you have a ground wire from the bridge to the back of the volume/tone pots?
Are all grounds conected together?
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Old 01-13-2013, 12:15 PM   #3
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Quote:
Originally Posted by Robbgnarly
do you have a ground wire from the bridge to the back of the volume/tone pots?
Are all grounds conected together?

"Wire from bridge is soldered with bridge tone control." Yes, all grounds are conected.


Can it be switch fault for the grounding?

Last edited by Manvydas : 01-13-2013 at 12:17 PM.
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Old 01-13-2013, 12:18 PM   #4
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It could be the switch is not grounded properly.
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Old 01-13-2013, 12:21 PM   #5
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Quote:
Originally Posted by Robbgnarly
It could be the switch is not grounded properly.


But there is no lose connections (wires) on switch.
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Old 01-13-2013, 01:50 PM   #6
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it's a little hard to follow your post.

But you are definitely going to need to keep trying those wires.

you can swap out the switch or the pots, if you think damage was done during shipping.

but if you are getting buzz that stops when you Zero the tone pot, then a wire is mixed up, touch something, or you made a bad connection when you fixed something.
(or the bridge wire is not connected to metal properly, ect)

sometimes really good pics can help.
might show a cold joint.
or a missing wire.

but often you are going to be on your own check each wire and adding more ground wires until the humming stops.
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Old 01-14-2013, 04:49 PM   #7
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Today i checked bride connection with grounding wire, i think something is wrong. I connected bridge with pot just with wire (no soldering, just for testing), so all strings now grounded, but still when i don't touch strings guitar is humming.

I think i will try post some photos tomorrow.
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Old 01-14-2013, 05:52 PM   #8
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What type of guitar is it Telecaster/Stratocaster/Les Paul/SG?
I would be willing to bet that your bridge is not grounded. When you touch the strings, you become the ground for the circut thats why the hum stops.


Take the bridge pickup out of the guitar there should be a seprate wire runningfrom the back of the pot to a hole that goes to the bridge plate or Stud of the tail piece.

If it has a tremelo bridge like on most strats/Floyd rose guitars there will be a wire in the tremelo cavity on the back of the guitar. It will be attached to the spring claw and then screwed into the body on a cunductive paint.
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Old 01-15-2013, 12:43 PM   #9
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It is Les Paul
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Old 01-28-2013, 05:38 AM   #10
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So hi again, have one photo from my guitar.

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Old 01-28-2013, 05:40 AM   #11
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Yellow wires come from switch
Green from bridge
blue from pickups

first thing i will do is to cut this ****ing wires off, such a mess
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Old 02-09-2013, 10:41 AM   #12
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Hello again. I have a question, how to remove audio noise from guitar, I made good grounding. But still it have a lot of noise, maybe I need to cut wires, and made them little shorter? Any tips?
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Old 02-09-2013, 06:34 PM   #13
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That is horrible horrible wiring.

From what I can tell, only the pickup cables have any kind of shielded wiring, the rest is utter spaghetti. The hot wire from the out jack is just a single core wire. It should be shielded cable. Hell any hot wire that carries any kind of pickup signal at all should be shielded cable.

I see it goes into the cavity, loops around a bunch of other wires, comes back and then finally terminates.

What a botch job.

What you need is shielded cabling and a one point common ground. Use direct point to point wiring. Wiring which goes via Antarctica first before it gets to its termination is rubbish

If that was mine, I'd strip the lot completely and start again
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Last edited by Phoenix V : 02-09-2013 at 06:36 PM.
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Old 02-10-2013, 08:42 AM   #14
Manvydas
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Thank you, maybe you can tell me more about wires, because I am new at soldering and etc. so I need little help. This was done by creators of this guitar. Maybe you can help find some information. Thanks.
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Old 02-10-2013, 11:05 AM   #15
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Some of those solder joints look a bit suspect. (upper left pot for one) if you haven't soldered before there is a proper technique to it. You might want to practice on something else before you do the repairs on your guitar. Just check the web for "soldering technique"

Last edited by NormH3 : 02-10-2013 at 11:07 AM.
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Old 02-11-2013, 12:10 AM   #16
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What the poster above said is correct. If you haven't soldered before, you'll need a good amount of practice before tackling this. Or, if you know someone that is proficient (and careful) with a soldering iron around a guitar body, have them do it for you.

The wiring is still the same as the guitar is currently wired, but you use shielded wire instead of single core spaghetti. Shielded wiring is like the cables from your pickups, where the hot wire is surrounded by the ground sheath.

You will want to use this kind of cable throughout, from the pickups, all the way to the output jack. Short direct cables. Tie all the grounds to a central point and make sure all your pot chassis, selector switch chassis and bridge chassis are grounded too. Only allow a little bit extra cable length to the output jack, switch and pickups in case you ever need to swap it so you can pull it out a little bit to get to the cable.

Importantly, when terminating, only expose as much of the hot wire from the shield as you need to complete the termination. Don't strip and expose inches of hot wires from the shielded cables, else you'll have the same problems you're having now

The only wire that isn't shielded, is the bridge wire to ground.
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Last edited by Phoenix V : 02-11-2013 at 12:12 AM.
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