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Thread: Ignition switch question

  1. #1
    slpro1207's Avatar
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    Ignition switch question

    I have a external fuel pump that runs when I hook up the battery. I have traced in back to the ignition switch. The ig post in the switch is hot even when there is no key. I have double checked wire position.
    Red to B, blue to st, orange to ig, and brown to acc. Any ideas? Maybe bad switch?


    Additional information. The ignition post to the switch is powered up even when key is in off position. But the wire to it is not feeding it.
    Last edited by slpro1207; 05-16-2018 at 07:18 PM. Reason: Added information
    MK4 delivered 2/24/2017. Complete kit #9023,IRS, Power Steering, Leather, heater, 17" wheels, sway bar ft & rr, tremec 600 and Gordon Levy Racing SBF 427. First start and go kart 8/19/2017. Graduated 1/15/2018
    MK4 #9230 complete kit delivered 1/27/2018. IRS, PS, leather, Tremic 600, SBF 427. Graduation 10/15/2018
    MK3 #5253 donor bought unfinished. SBF 331, T5 Trans.

  2. #2
    Senior Member edwardb's Avatar
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    That's how it should be wired. Not meaning to insult, but any chance you're mis-reading the labels on the switch and which terminals they refer to? Of course it's possible the switch could be bad (it's happened...), but seems strange.
    Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
    Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
    Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.

  3. #3
    slpro1207's Avatar
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    I double checked. Removed and replaced them just to be sure. This has me baffled. And with the switch off there is no continuity between b and ig. I have removed the org wire and the ig post is hot when switch is off and red battery wire is on B
    MK4 delivered 2/24/2017. Complete kit #9023,IRS, Power Steering, Leather, heater, 17" wheels, sway bar ft & rr, tremec 600 and Gordon Levy Racing SBF 427. First start and go kart 8/19/2017. Graduated 1/15/2018
    MK4 #9230 complete kit delivered 1/27/2018. IRS, PS, leather, Tremic 600, SBF 427. Graduation 10/15/2018
    MK3 #5253 donor bought unfinished. SBF 331, T5 Trans.

  4. #4
    Papa's Avatar
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    Is this issue new? Has it worked properly in the past?
    My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
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  5. #5
    slpro1207's Avatar
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    Quote Originally Posted by Papa View Post
    Is this issue new? Has it worked properly in the past?
    This is a new install. My second build. It’s definitely powering the fuse panel with the key removed. I have turn indicaters.
    MK4 delivered 2/24/2017. Complete kit #9023,IRS, Power Steering, Leather, heater, 17" wheels, sway bar ft & rr, tremec 600 and Gordon Levy Racing SBF 427. First start and go kart 8/19/2017. Graduated 1/15/2018
    MK4 #9230 complete kit delivered 1/27/2018. IRS, PS, leather, Tremic 600, SBF 427. Graduation 10/15/2018
    MK3 #5253 donor bought unfinished. SBF 331, T5 Trans.

  6. #6
    Papa's Avatar
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    As Paul said, it could be a bad switch. It seems that around the time I was debugging my electrical issues, there were a few guys that had bad switches. Do you have an ohm meter? If so, remove any wires attached and test the switch on its own for continuity in the proper key positions. That will rule out any potential wiring problems. If the switch checks out, start checking for proper chassis grounds at the battery and the main harness.
    My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
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    slpro1207's Avatar
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    On the bench the switch has no continuity when in the off position. Has continuity in the on position. When the battery wire is connected to post B I have power to the IG post with no other wires connected and in all key positions except ACC. I would suspect bad switch except the fact I don’t have continuity between B and IGN post when there is no power. Also the orange ign wire is dead so it’s not feeding anything.
    I’m missing something.
    MK4 delivered 2/24/2017. Complete kit #9023,IRS, Power Steering, Leather, heater, 17" wheels, sway bar ft & rr, tremec 600 and Gordon Levy Racing SBF 427. First start and go kart 8/19/2017. Graduated 1/15/2018
    MK4 #9230 complete kit delivered 1/27/2018. IRS, PS, leather, Tremic 600, SBF 427. Graduation 10/15/2018
    MK3 #5253 donor bought unfinished. SBF 331, T5 Trans.

  8. #8
    Papa's Avatar
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    So with nothing connected to the switch you have no continuity in the key off position to any of the IGN, ACC, and ST posts, but you do when you connect the power wire to the B post? I'm leaning toward a ground issue.
    My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
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    Delivered: 6/17/2017
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    Completed: 12/7/2019
    Legal: 1/30/2020

    Member of the Mile-Hi Cobra Club
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  9. #9
    Papa's Avatar
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    I have a brand new switch that I ordered when I thought I fried mine. I was able to replicate the behavior you describe if I connect the power to the IGN vs B terminals (i.e. treat the IGN as the B terminal). I'm not actually applying power, but using a continuity tester. It's possible that the switch was wired internally incorrectly.
    My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
    (Most viewed Roadster build thread on this forum!)

    Delivered: 6/17/2017
    First Start: 12/30/2017
    Completed: 12/7/2019
    Legal: 1/30/2020

    Member of the Mile-Hi Cobra Club
    Dave's Cobra YouTube Channel: https://www.youtube.com/channel/UCbk...npK1UZHj4R-bYQ
    Agora 1:8 Scale Cobra Build: https://thefactoryfiveforum.com/show...l-Build-Thread

  10. #10
    slpro1207's Avatar
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    Quote Originally Posted by Papa View Post
    I have a brand new switch that I ordered when I thought I fried mine. I was able to replicate the behavior you describe if I connect the power to the IGN vs B terminals (i.e. treat the IGN as the B terminal). I'm not actually applying power, but using a continuity tester. It's possible that the switch was wired internally incorrectly.
    Brilliant. The switch is wired backwards. I connected battery to IG and ignition switch wire to B and it works properly. I have to order a new switch. Thanks for steering me in the right direction.
    MK4 delivered 2/24/2017. Complete kit #9023,IRS, Power Steering, Leather, heater, 17" wheels, sway bar ft & rr, tremec 600 and Gordon Levy Racing SBF 427. First start and go kart 8/19/2017. Graduated 1/15/2018
    MK4 #9230 complete kit delivered 1/27/2018. IRS, PS, leather, Tremic 600, SBF 427. Graduation 10/15/2018
    MK3 #5253 donor bought unfinished. SBF 331, T5 Trans.

  11. #11
    Senior Member edwardb's Avatar
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    Quote Originally Posted by slpro1207 View Post
    Brilliant. The switch is wired backwards. I connected battery to IG and ignition switch wire to B and it works properly. I have to order a new switch. Thanks for steering me in the right direction.
    Glad you figured it out. I suspect there's no wiring inside that switch. Probably some type of rotating contact assembly. Sounds like it was assembled incorrectly and apparently not even the most rudimentary continuity test.
    Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
    Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
    Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.

  12. #12
    Senior Member CraigS's Avatar
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    Quote Originally Posted by slpro1207 View Post
    Brilliant. The switch is wired backwards. I connected battery to IG and ignition switch wire to B and it works properly. I have to order a new switch. Thanks for steering me in the right direction.
    heck mark it correctly w/ a sharpie and go!
    FFR MkII, 408W, Tremec TKO 500, 2015 IRS, DA QA1s, Forte front bar, APE hardtop.

  13. #13
    Boydster's Avatar
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    Quote Originally Posted by CraigS View Post
    heck mark it correctly w/ a sharpie and go!
    My thoughts exactly.
    ---Boyd---
    MkIV #9042 build thread
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  14. #14
    slpro1207's Avatar
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    Quote Originally Posted by CraigS View Post
    heck mark it correctly w/ a sharpie and go!
    My thoughts too, however further testing shows that the post that is marked ACC is the post that is activated with the key rotated fully clockwise(starter activation). I could switch the acc wire and the starter wires but I found the ST post is also hot with switch in off position. I don’t know if I’m making any sense but I don’t but I don’t think the ACC should be on with key off.
    MK4 delivered 2/24/2017. Complete kit #9023,IRS, Power Steering, Leather, heater, 17" wheels, sway bar ft & rr, tremec 600 and Gordon Levy Racing SBF 427. First start and go kart 8/19/2017. Graduated 1/15/2018
    MK4 #9230 complete kit delivered 1/27/2018. IRS, PS, leather, Tremic 600, SBF 427. Graduation 10/15/2018
    MK3 #5253 donor bought unfinished. SBF 331, T5 Trans.

  15. #15

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    Sounds like the plastic insert is indexed off 90 degrees.
    Mike

  16. #16
    Senior Member Walt's Avatar
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    Think i would get Factory Five to sent me a new one with keys!
    FFR8237 Donor build 89 GT , MK 4 , T5 , 17 " hallibrands 9" front 10.5 rear ,4×4 headers stainless mufflers, dual chrome roll bars, coil overs all 4,A/C and heater , soft top, 3:55 gears.

  17. #17
    Senior Member CraigS's Avatar
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    I go a ColeHersey brand switch online. Most auto parts stores have generic switches also.
    FFR MkII, 408W, Tremec TKO 500, 2015 IRS, DA QA1s, Forte front bar, APE hardtop.

  18. #18
    bobl's Avatar
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    Great catch Papa!

    Quote Originally Posted by Papa View Post
    I have a brand new switch that I ordered when I thought I fried mine. I was able to replicate the behavior you describe if I connect the power to the IGN vs B terminals (i.e. treat the IGN as the B terminal). I'm not actually applying power, but using a continuity tester. It's possible that the switch was wired internally incorrectly.
    Mk IV Roadster, 347/516 HP, 8 stack injection, Holley HP ECU, Astro Performance T5, 3-Link 4.10 gears, A/C, PS, PB Purchased 08/2015, Graduated 02/2017

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