Go Back  Quiltingboard Forums >
  • Main
  • For Vintage & Antique Machine Enthusiasts
  • questions about rewire for a 15-91 >
  • questions about rewire for a 15-91

  • questions about rewire for a 15-91

    Old 02-20-2014, 06:20 AM
      #1  
    Super Member
    Thread Starter
     
    Join Date: Dec 2010
    Location: Michigan
    Posts: 3,334
    Default questions about rewire for a 15-91

    I'm ready to start replacing the old wire on my 15-91 and I have a few questions. The new wire has printing on one side and I assume that is the (+) side. But the old wire doesn't have anything to help me decide about the positive and negative side. The plug is the old type where the prongs are the same width.

    I got a wiring diagram from sew-classic but it doesn't show + and - either. So, can someone help me with a diagram showing + and - for wiring this 15-91. I do plan on removing the old wire and replacing the new wire one wire at a time. I just don't want to hook it up wrong and burn out my motor or something. I'm thinking that + and - does matter for the motor and the light even though the foot controller is just a switch and doesn't matter. Thanks to Joe, I learned that.

    I'm still a little nervous about electricity..... very high respect for it but if I don't know what I'm doing...... ??? Fireworks are pretty but not when it's my sewing machine.... if you know what I mean.
    nanna-up-north is offline  
    Old 02-20-2014, 07:53 AM
      #2  
    Super Member
     
    Join Date: Feb 2012
    Posts: 8,091
    Default

    Jean,

    Are you going to rewire the motor, the connector block, just replace the cords, or all of them?

    The motor has red and black wires inside, I matched that when I did mine.
    The connector block is color coded. Basically just match the new to the old.
    The cord sets are already wired, just attach the controller, it's not polarized.

    Here is two places to read:
    { http://www.quiltingboard.com/vintage...r-t205360.html }
    { http://vssmb.blogspot.com/search/label/rewiring }

    Sometimes the side of the wire with the printing is the + side. Sometimes the wire has ribs on it as well. It drives me crazy trying to figure it out cos there seems to be no hard and fast rule of which method of marking means what.

    Joe
    J Miller is offline  
    Old 02-20-2014, 09:01 AM
      #3  
    Super Member
     
    Join Date: Aug 2013
    Location: Springfield Oregon
    Posts: 1,481
    Default

    technically, the motor type is ac/dc and its windings are not polarized. AC plugs weren't polarized then either. The color markings are to aid in assy. Neither leg should be making any contact with metal you can check your work when fone by having it unplugged from the wall, use a continuity checker and verify there is continuity through the motor wirin but none from either leg to the metal housing.
    oldsewnsew is offline  
    Old 02-20-2014, 09:03 AM
      #4  
    Super Member
    Thread Starter
     
    Join Date: Dec 2010
    Location: Michigan
    Posts: 3,334
    Default

    Thanks, Joe. I'm just going to replace the wire. I took the machine out of the cabinet and marked the ends of the wires.... which go to 1 which go to 2, etc. The old wire started crumbling and exposing the wire.... that means it needs to be replaced. So, I'll read what you suggest and get back with you. We're having a pretty bad storm going through right now so we may loose power. I sure hope not but I may be able to check things out.... I may not. I do have the 'puter unplugged right now. I don't want to fry the 'puter.
    nanna-up-north is offline  
    Old 02-20-2014, 09:11 AM
      #5  
    Super Member
    Thread Starter
     
    Join Date: Dec 2010
    Location: Michigan
    Posts: 3,334
    Default

    Originally Posted by oldsewnsew
    Neither leg should be making any contact with metal you can check your work when fone by having it unplugged from the wall, use a continuity checker and verify there is continuity through the motor wirin but none from either leg to the metal housing.
    Thanks OSS. I do have a continuity tester. So, if I understand you correctly, if I've wired it correctly, I should get conductivity when I touch the wire going to and from the motor, to and from the foot controller and to and from the light. Is that correct?

    Basically, if I follow the wires that are there and assign the 1st one as positive I should be okay, correct? I just need to be careful which # on the 3-pt plug is to be + and which is to be -. But if I assign the 1st one to be negative, that's okay, too? ... as long as I keep track of the +'s and -'s to assign to the other points?
    nanna-up-north is offline  
    Old 02-20-2014, 09:48 AM
      #6  
    Super Member
     
    Join Date: Aug 2013
    Location: Springfield Oregon
    Posts: 1,481
    Default

    youll get continuity thru the motor. the contoller may not show continuity until its almost fully depressed. The lite wiring will show cont only with a good bulb and the switch on. And it may not be 0 resistance because the bulb filament has a small amount of tesistance. I test my reworked motors by leaving their cord long putting a temp plug on them do I can check them with an old style line wiring receptacle block. Also helps to plug into a gfci outlet even tho its not a grounded 3 prong plug, because theyLl trip faster
    oldsewnsew is offline  
    Old 02-20-2014, 09:51 AM
      #7  
    Super Member
     
    Join Date: Aug 2013
    Location: Springfield Oregon
    Posts: 1,481
    Default

    not to worry you needlessly, but you are safer to plug it in with your left hand in your pocket so as to not provide a return path thru your body.
    oldsewnsew is offline  
    Old 02-20-2014, 11:07 AM
      #8  
    Super Member
    Thread Starter
     
    Join Date: Dec 2010
    Location: Michigan
    Posts: 3,334
    Default

    What about your feet on the ground?? Okay, I totally understand the left hand in the pocket..... scary.... I know just enough to make me dangerous.
    nanna-up-north is offline  
    Old 02-20-2014, 11:10 AM
      #9  
    Super Member
     
    Join Date: Aug 2013
    Location: Springfield Oregon
    Posts: 1,481
    Default

    rubber soled shoes, dry floor.
    oldsewnsew is offline  
    Old 02-20-2014, 11:18 AM
      #10  
    KLO
    Super Member
     
    Join Date: Aug 2010
    Location: North Central, NC
    Posts: 2,741
    Default

    I need to keep track of this thread because I think my new-to-me 15-91 needs some electrical work too. Thanks for all the info. even though I was not the first to ask.
    KLO is offline  
    Related Topics
    Thread
    Thread Starter
    Forum
    Replies
    Last Post
    joobee
    For Vintage & Antique Machine Enthusiasts
    5
    07-27-2015 01:50 PM
    MFord
    For Vintage & Antique Machine Enthusiasts
    13
    04-22-2015 01:07 PM
    zozee
    For Vintage & Antique Machine Enthusiasts
    7
    11-24-2013 08:01 AM
    PATTIESPEARL
    For Vintage & Antique Machine Enthusiasts
    16
    03-23-2013 08:18 AM
    Quilt Novice
    For Vintage & Antique Machine Enthusiasts
    8
    07-12-2012 03:53 PM

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off


    FREE Quilting Newsletter