Wiring problems- HELP!

Discussion in 'Luthier's Corner' started by beefyburt, Oct 19, 2017.

  1. beefyburt

    beefyburt Member

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    So in my SG Standard, I was gong to fit some Iommi pickups, but the deal fell through, so instead I bought some John Birch Fang Cobra ones. They came with a single wire, and so I assumed it would be very simple to wire up.
    I removed the old pickup wires- earths from the back of the volume pot, and red live off the lug. I then soldered my new braided wire to the back of the volume pot and then to the same lug as the old one. But...no sound. So I undid them both, did again, but still no sound. What am I doing wrong? I did take some pictures but they are too big, so will take again tonight when at home but anyone any ideas now?
     
  2. donepearce

    donepearce Well-Known Member

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    You get it that the single wire you mention is in fact two wires? The outer one is a braided sleeve and the inner one lives inside it, and is covered with insulation? The braided sleeve gets soldered to the pot body, and the inner wire goes to the hot end of the volume control. If you are new to soldering it is all too easy to find you have overheated a wire sufficiently to have melted through that insulation so the inner wire is now shorted to the outer braid. Could that possibly have happened?
     
  3. Rox

    Rox Active Member

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    Do you have a multimeter? The first thing to do is to check the pickup actually works.
     
  4. beefyburt

    beefyburt Member

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    Well that is possible but not sure. Yes I'm new to all this, so I could have messed it up. Will check tonight, thanks.
     
  5. beefyburt

    beefyburt Member

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    No sorry don't have a multimeter, but I was told they were fully working.
     
  6. donepearce

    donepearce Well-Known Member

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    You can get a multimemter for a few dollars, and it is one of the best tool investments you will ever make.
     
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  7. beefyburt

    beefyburt Member

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    Managed to resize one of the photos, see enclosed.
     

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  8. beefyburt

    beefyburt Member

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    Here is a resized image...
     

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  9. donepearce

    donepearce Well-Known Member

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    Yep, it looks like the outer braid is extending too far past the pot and shorting out to the active wire. If you unsolder those, you can pull the outer braid back to expose the inner. Just solder the last quarter inch of outer braid onto the pot casing

    Like this

    upload_2017-10-19_15-38-40.png
     
  10. beefyburt

    beefyburt Member

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    Ok brilliant, will give that a go. Many thanks!
     
  11. beefyburt

    beefyburt Member

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    Well I re did it but still nothing so I just took the pickups out and put back the old ones which worked perfectly. Will get the Cobras tested to make sure they do work, then sell on.
     

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  12. donepearce

    donepearce Well-Known Member

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    Yes, that should have done it. Now is the time you need that multimeter.
     
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  13. Chubbles

    Chubbles Well-Known Member

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    I went high end on the multimeter. I am a proud owner of a 4.99 (on sale) Harbor Freight multimeter. It's served me for quite a while. It's a time saver.
     
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  14. Rox

    Rox Active Member

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    I bought a set of Texas Specials for a strat, and was told they were working. Because it was for a project, they stayed in their box until eventually I installed them, and one didn't work.

    I had a similar experience with a pair of Burstbuckers too. :(

    So if I buy pickups but I'm not going to install them yet, I always check them with a multimeter.
     
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  15. beefyburt

    beefyburt Member

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    Thanks everyone, lessons learnt eh.
     

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