pickup reads ok - no sound

Discussion in 'Tele-Technical' started by old_picker, Dec 12, 2019.

  1. old_picker

    old_picker Tele-Afflicted

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    signal from + to - reads 8.5k ish
    continuity from output lug on pot to tip of output socket 0.0k
    continuity from output lug to earth 1.0k
    Should read 8.k right
    tap slug with metal no tap sound
    Looking at a faulty pot here?
     
  2. DougM

    DougM Friend of Leo's

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    Plug a cable into the output jack on the guitar, set the selector switch to the pickup in question, turn the volume pot up all the way and connect your ohm meter to the two contacts on the plug on the cable. If you don't get an 8k reading there, then there's something in the wiring between the pickup and the output jack. Trace it back to where you get a good reading and then it's something in the wiring between that point and the output jack. It could be the switch, a pot, or a bad solder joint. Make sure there's continuity between all your ground points. Check the pickup's ground lead to all the other ground points, it's hot lead to the switch, the output of the switch to the volume pot, the output of the volume pot to the jack, etc
     
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  3. radiocaster

    radiocaster Poster Extraordinaire

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    You have to put your volume on max.
     
  4. old_picker

    old_picker Tele-Afflicted

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    found it - there's a 3way tag strip in the circuit before the output socket - when the toggle is on the bridge pup 8k - when on the neck open circuit

    thank you
     
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  5. old_picker

    old_picker Tele-Afflicted

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    nope still not working... tag strip was a red herring --tele deluxe twin humbuckers with 2 vol 2 tone wired like an LP

    back at the pot
    pickup input [outer] lug to earth 8.5k
    return from switch [center lug] to earth 1 - open circuit - should read 9.5k
    from switch to center lug continuity ok

    next is the switch:
    pickup to switch connected
    switch to pot connected
    switch output lug to earth no reading open circuit
    switch contact pickup in to output socket tip connected
    switch contact pickup out to output socket tip connected

    any of the hot points on the switch to earth - open circuit - should read 8.5k
    the contacts are connected to the output socket tip indicating switch is ok [switchcraft]

    anywhere in the circuit after the pickup input on the pot where it reads 8.5k hot to earth is open circuit
    so we have either a faulty pot or a bad connection on the center lug [output to switch]

    the other volume pot has already been replaced so maybe a bad batch?
    sound logical?

    I'll pull the hot from pickup off the pot and wire it direct to the output socket tip and I am hoping to get some noise. will report back
    meanwhile any other ideas?
     
  6. Peegoo

    Peegoo Tele-Holic

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    You are on the right track. Isolate the components from one another and check each for spec and faults.

    My approach to troubleshooting a circuit, whether a passive guitar circuit, a vacuum cleaner, or a tube amp, is to cut it in half somewhere near the middle (not literally...figuratively) and test each half. The idea here is to use the process of elimination, because when you find the bad half, cut that bad half in half and test each half again. Chasing and locating the source of a fault is fast this way because it steers you to the single bad component.
     
  7. old_picker

    old_picker Tele-Afflicted

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    pickup works everything is good except pot - great gobs of solder everywhere a really dud job someone has done rewiring this lovely old guitar. I'lll rip it out and start anew with a cavity rewire

    thanks for your replies
     
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