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Volume pot issue

Discussion in 'Tele-Technical' started by JSMac, Apr 21, 2021.

  1. JSMac

    JSMac Tele-Holic

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    Hey folks,

    I'm installing a Hot Rails in an Esquire build. I'm using a push/pull volume pot for coil tapping. The coil tap wiring seems to be correct and probably doesn't have anything to do with this issue.

    The pot seems to be working when I test it with an ohm meter. It ranges from about 23 ohms the 475k. But, when I wire it up It doesn't cut the signal. The pickup is wired to the outer lug and the jack is wired to the center lug. I can't figure out how the signal is getting through with the volume turned down? Any ideas?
     
  2. ale.istotle

    ale.istotle Tele-Holic Silver Supporter

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    Is the other outer lug wired to ground? The pot doesn't really cut the signal. It shunts part of it to ground.
     
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  3. JSMac

    JSMac Tele-Holic

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    The other outer lug is grounded.
     
  4. ale.istotle

    ale.istotle Tele-Holic Silver Supporter

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    Well, It's time for pics I guess.
     
  5. LutherBurger

    LutherBurger Poster Extraordinaire

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    Wait a minute. Isn't it supposed to start at ZERO Ohms?
     
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  6. Falstaff1960

    Falstaff1960 TDPRI Member

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    oh..so not a thread about having too much weed on hand?
     
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  7. JSMac

    JSMac Tele-Holic

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    I don't think I've seen one read zero unless it was a no load pot.
     
    Last edited: Apr 21, 2021
  8. JSMac

    JSMac Tele-Holic

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    This may not be much help. I’ve been clipping in the connections with jumpers.

    The white wire on the left is the signal from the pickup. I connect the center lug to the output jack. I connect the right outer lug to the ground of the output jack and to the pot housing.

    47EEDF6B-356C-4D4D-AECE-D9D162253D32.jpeg
     
    Last edited: Apr 21, 2021
  9. TwoBear

    TwoBear Tele-Holic

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    Is the push pull the volume? My eyes suck but it doesn’t look like it has anything connected to the middle?
     
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  10. JSMac

    JSMac Tele-Holic

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    Sorry, I edited my last post to describe how I wire it.
     
  11. TwoBear

    TwoBear Tele-Holic

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    When I blow up the picture and I see that push pull pot better the one white wire that I see on the left appears to have a line may be a cold solder joint. Another picture may help maybe one without a reflection or someone else with better eyes will probably chime in pretty quick. But yeah 23 ohms? maybe in circuit with some thing but they pretty much go to zero, or 0.1? with the wiper pulled To outside lug. Or at least they should
     
  12. JSMac

    JSMac Tele-Holic

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    Sorry for the poor picture. The white wire isn’t soldered. I just laid it against the lug to show where I connect it.
     
  13. TwoBear

    TwoBear Tele-Holic

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    I only see a white wire coming from your white alligator clip/switch and going to the outside lug of that pot. It looks like your red and white go to the switch part of your push pull pot but I don’t see any more connections to the middle and other outer lug of your pot?
     
  14. JSMac

    JSMac Tele-Holic

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  15. LutherBurger

    LutherBurger Poster Extraordinaire

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    I know this isn't helpful at this point in your project (Sorry.) but I just measured the resistance of a few CTS pots between lugs 1 and 2 with the wipers turned fully counterclockwise, and they all read zero Ohms. That's with nothing connected to the pots, though.
     
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  16. JSMac

    JSMac Tele-Holic

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    I may be wrong about that. Now I’m curious so I’ll check some new pots and see what they read.
     
  17. JSMac

    JSMac Tele-Holic

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    Alrighty then. The pot is bad. I noticed that when I tested between the center lug and the outer one that would normally be grounded I didn't get a reading unless I pressed down fairly hard on it with my probe. With just good contact, no reading. So, it wasn't being internally grounded when it was wired up. It is a used pot that came with the used pickup.

    I clipped in another pot and BINGO. I'll need to buy another push/pull pot.

    BTW, I tested 4 new CTS pots and none of them read zero when rolled all the way off. They all read between 3.2 and 4.8 ohms, FWIW.
     
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