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Thread: New Build, Electrical Supplies, Tools and Equipment

  1. #1
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    New Build, Electrical Supplies, Tools and Equipment

    Starting a new Mk5 build. Much of the electrical aspect of the build is new to me. Looking for guidance/recommendations.
    - Butt Connectors....Combination crimp/heat shrink vs standard metal crimp with separate heat shrink vs newer solder/heat shrink?
    - Waterproof/Deutsch Connectors for lights and others...Particular quality brands, style and total number probably needed?
    - Relays...... Fan switch and seat heater switch?
    - Harness Tape.... TESA
    - Heat Gun.....Master Appliance vs others?
    -Power Probe III for troubleshooting?
    - OTHER Items?

    All suggestions appreciated.
    Ed

  2. #2
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    Random responses: I'm not a fan of the butt connectors that come in the kit. I use other methods. Most of us use Weatherpack connectors for the lights and others. Widely available, relatively cheap. Make sure you have the proper crimper. Deutsch products are excellent, but I personally don't use them. The Ron Francis fuse panel has a relay for the fan. The usual seat heaters (CobraHeat) have relays and switches built in. How many relays you add depends entirely on your electrical setup. I've tried TESA tape. OK I guess. I have a DeWalt heat gun. Has worked fine for me. I have a Power Probe. Don't use it as much as I thought I would. A good quality VOM does most of what I need.
    Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. 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. Build 5: 35 Hot Rod Truck #138. Build Thread. Sold 11/9/2023. Build 6: Mk5 Roadster 30th Anniversary #11,258. Build Thread.

  3. #3
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    Skip the power probe. Instead, use the coin to buy a brand name multimeter and test light (with conventional bulb, not LED) like this:
    https://www.sparesbox.com.au/product..._3HlEN0_pKnD84

    A set of alligator clips is handy for the multimeter.

    Ratchet type crimp tools are good.
    Weatherpak connectors are more than adequate.
    Keep in mind most cobras never get wet.

    Good ground connections are important.

    Cheers,
    Nige
    Mk.4 FFR supplied Right hand drive
    Received 12/2012 completed 12/2019
    Gen1 Coyote / TKO600 / IRS
    Lots of mods to make compliant for Australian design rules

  4. #4

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    Butt Connectors: Permaseal
    Electrical Connectors: Weatherpack
    Heat Gun: Harbor Freight
    Electrical Tape: 3M Super 88. But I do try to use heat shrink on tubing instead wherever I can. Looks much cleaner.
    MKIV Roadster - #9380 - Complete Kit - Delivered 7/17/18 - SOLD 5/2023
    Build Thread #1: https://thefactoryfiveforum.com/show...V-Build-Thread
    MKIV Roadster - #10827 - Complete Kit - Delivered 11/6/23 - Final Punch
    Build Thread #2: https://thefactoryfiveforum.com/show...Build-Thread-2

  5. #5
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    You got this.

    I have a hair dryer looking heat gun, probably HF, that has served me for decades. I also have this one for solder connectors that I really like a lot. https://www.amazon.com/dp/B08VFY8THD...fed_asin_title

    For butt connectors I like these https://www.mcmaster.com/products/el...utt-splices~~/

    And these https://www.amazon.com/dp/B095P47Y8G...sin_title&th=1

    As Nigel said a simple test light is about as handy as a pocket on a shirt.

    Weather packs are great, just make sure you use the correct pins for the wire size and the correct crimpers.

    And last, get yourself a bottle of this.

    449466863_474038111877403_2753220876160107107_n.jpg
    My build thread https://thefactoryfiveforum.com/show...Roadster-Build

    Thread on Stainless Steel AN brake lines.
    Thread on fasteners and torque wrenches.
    Thread on Wilwood & Tilton master cylinders

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  7. #6
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    I did not use the FFR supplied wireing harness except for the "headlight / front" section and the back half of the rear harness. I s#*t canned the RF supplied conduit and used high quality "Painless" conduit. I designed my own electrical system and used relays for most everything. Also no fuses, I used circit breakers. As mentioned above Summit sells several quality brands of weatherpac connectors in kit form. They also have high quality crimpers. You might concider getting a quality wire striper as well. You wont be able to do without a volt ohm meter and a cheap HF test light. Whenever you have to splice a wire, solder it and use heat shrink. Dont use any of the FFR butt splices or treminal ends. Buy the good stuff that has the heat shrink built in. I use a paint stripping heat gun from Ace Hardware.

    Happy trails

    https://www.summitracing.com/parts/kle-11063



    https://www.summitracing.com/parts/sum-900404

    https://www.summitracing.com/parts/prf-70970.

    https://www.summitracing.com/parts/sng-18915

    https://www.summitracing.com/parts/der-16765

    DSC03058.JPGDSC03062.JPGDSC03077.JPGDSC03076.JPGDSC03133.JPGDSC03882.JPG
    Last edited by Rebostar; 09-27-2025 at 04:55 PM.

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