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Thread: Brake light switch question

  1. #1

    Join Date
    Apr 2017
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    Brake light switch question

    I am adjusting the brake light switch supplied with the MK4 complete kit. On my Ron Francis Manual (Revision S, February 2017) it says to hook up the wires to a specific set of terminals on the switch. However, when I use my multimeter continuity tester, that switch terminal is normally a closed circuit. When I push on the brake pedal, the circuit opens. Is that correct for the brake lights? The other set of terminals labeled "clutch switch" is just the opposite. It is normally an open circuit and when I press on the pedal, the circuit completes. I'm not an electrical guy but I can follow schematics and directions. Am I missing something here about the brake light electrical system and just not getting it?

    build thread: http://thefactoryfiveforum.com/showt...-USRRC-vspeeds

    Build School: July 14-16, 2017
    Kit purchased: July 25, 2017
    Kit delivered: September 13, 2017
    First Start: December 22, 2018
    Body painted and kit completed and drivable: July 2019 (but still not done)
    CA SB100 Registration: January 2020

    Mk4 - 289 USRRC Roadster kit, Roush 427SR with Schneider Racing custom camshaft, Fitech EFI, TKO600 (.64-5th gear), 15" wheels, stock brake calipers, under car exhaust with Spintech 7000 muffler, no roll bar, Russ Thompson turn signal, removable steering wheel, and many other small upgrades and modifications

  2. #2
    Papa's Avatar
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    Dec 2016
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    I had the same issue and switched the wires to the other terminals and all was fine. Interestingly, the other switch worked as described in the manual for the clutch safety switch. Just wire them whichever way works.
    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
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  3. #3
    Senior Member Fixit's Avatar
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    Aug 2017
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    iagree.gif Use the "clutch" set of contacts. (Switch at rest/plunger out, the circuit should be closed)
    John D. - Minneapolis 'Burbs

    1965 El Camino - LT-1, 4L60e, 4wh discs, SC&C susp.
    2013 F-150 Platinum - Twin Turbo 3.5
    2018 Mk4 Roadster w/ Coyote - #9365 - Build Thread Delivery 7/3/18, 1st Start 1/4/19, 1st Road Mile 5/5/19, Legal 6/18/19, In Paint 2/25/21, Done (?) 4/2021

  4. #4

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    My experience was consistent with Papa. The documentation is actually incorrect. Joel

  5. #5
    Boydster's Avatar
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    Aug 2014
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    Same here, year and a half ago.
    ---Boyd---
    MkIV #9042 build thread
    www.boss427.us
    427W, TKO600, Moser 3.55 rear.
    Delivered Feb 2017, Graduated Nov 4, 2019

  6. #6

    Join Date
    Apr 2017
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    Thanks gents

    I asked a separate question earlier asking how to wire my tail lights. Now that I know the terminals depicted in the manual for the brake light switch are incorrect, the rest of the brake wiring now makes sense to me.
    build thread: http://thefactoryfiveforum.com/showt...-USRRC-vspeeds

    Build School: July 14-16, 2017
    Kit purchased: July 25, 2017
    Kit delivered: September 13, 2017
    First Start: December 22, 2018
    Body painted and kit completed and drivable: July 2019 (but still not done)
    CA SB100 Registration: January 2020

    Mk4 - 289 USRRC Roadster kit, Roush 427SR with Schneider Racing custom camshaft, Fitech EFI, TKO600 (.64-5th gear), 15" wheels, stock brake calipers, under car exhaust with Spintech 7000 muffler, no roll bar, Russ Thompson turn signal, removable steering wheel, and many other small upgrades and modifications

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