Custom Harness protection

Electrical & Ignition

  1. 451Mopar

    451Mopar Well-Known Member

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    I'm wiring a modified '69 Dodge Coronet with a Ron Francis wiring kit, and had a few questions about the harness sleeving. The kit came with a roll of 1/2" Alex Tech PET braided cable sleeving, and a roll of 3/4" sleeving too. I like the braided sleeving, but have a few questions?

    1. Is Alex Tech the name of a distributors of the Techflex.com product line?
    All my searches just show the Techflex.com company products.

    2. If I use electrical tape, which one should I use. The 3M Scotch Super 33 seems popular and is rated for 220 degrees F. Just for comparison, the PET braided sleeving is rated for 257 degrees F.

    3. When using the braided sleeving, what is the procedure for making "T" and "Y" branches from the main harness.
     
  2. twecomm

    twecomm FBBO Gold Member FBBO Gold Member

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  3. Mike67

    Mike67 FBBO Gold Member FBBO Gold Member

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    33 will seep it's adhesive after long exposure to heat but is still really good general purpose electrical tape. I would use heat shrink in the engine bay or friction tape around high heat areas like the starter.
     
  4. 451Mopar

    451Mopar Well-Known Member

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    I have been using double wall 3:1 heat shrink on the harness ends, but I have some "T" branches at the headlights/turn signal, and no way to heat shrink the "T", so I was going wrap that part with tape. I noticed that super 88 is a thicker version of super 33, not sure if I need a thicker tape at this junction?
     
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    • Mike67

      Mike67 FBBO Gold Member FBBO Gold Member

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      I personally think you are fine with tape there... another thought if your going for points they make a wire loom T for convoluted tubing.

      Screenshot_20190830-102517.png
       
    • 69 GTX

      69 GTX FBBO Gold Member FBBO Gold Member

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      Try buying the 3/4-1" cloth tape. Doesn't ooze adhesive later and is a better heat protectant. Similar to the OEM tape.
       
      Last edited: Aug 30, 2019
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      • 451Mopar

        451Mopar Well-Known Member

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        Not going for points, just looking to close up the gap where I opened the weave and pulled the wires through, and to add some strain relief as you see the wires at the turnout from the main bundle before the heat shrink. Those plastic "T" shells look nice, but may make the bundle look really bulky?
        I have been trying to find more specific details on this loom construction stuff.
        For free, the NASA-STD-8739.4 standard had some good information:
        https://standards.nasa.gov/standard/nasa/nasa-std-87394

        I did not want to pay SAE for their publications ($80+ each.)
        At work, I can get SAE J1292 "Automobile and motor coach wiring" document, but its more of guidelines on wire and fuse sizing. Not so much how to do looms.
        SAE J1395 has some info on lighting requirements, but not helpful for what I'm doing.
        Federal Regulations, Title 49 not helpful either.

        Found this link to Air Force Space Command, SMC Standard SMC-S-020:
        https://apps.dtic.mil/dtic/tr/fulltext/u2/a633334.pdf

        Interesting Formula SAE Race car stuff:
        https://web.wpi.edu/Pubs/E-project/Available/E-project-040918-171052/unrestricted/MQP-AW1-FSAE.pdf

        Oh well, lunch is over, back to work....
         
      • steve340

        steve340 Well-Known Member

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        There is a special wrapping tape available that a friend of mine uses - it makes the wiring look original. It is about twice as wide as insulation tape and is sort of rubbery/stretchy.
        I do not know what it is called but it is definitely available and it does not ooze adhesive as other posters have said. Nothing worse that handling sticky gooey wiring.
         
      • 451Mopar

        451Mopar Well-Known Member

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        Part of the issues I'm having is there are so many products to choose from. Looking at the TechFlex web page they sell 86 different products. They list a lot of the properties, but not the price, so it is hard to figure which product makes the best choice between protection and cost.
        Same with the wraping tapes, there are several brands, temp ratings, widths, thickness, and material/construction like PVC, rubber, cloth, and the list goes on....
        Since we have the Ron Francsis kit, we don't have to figure which wire types to use (SAE J1128 Cross-Link Polyethylene (XLPE)) , and sizes (we did double check some of the cable AWG sizes though.)
        Because the dash (Speed Hut gauges, custom switched), and much of the vehicle is custom (Digi-Tails LED conversion tail lights, and EFI). Most of the terminal connection blocks are not the standard Packard 56 type.
        With all the different connector types need at least 3 or 4 different crimper types (basically each crimper type except MIL-38999, and deutsch.)
         
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        • Moparfeind

          Moparfeind FBBO Gold Member FBBO Gold Member

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          Hey 451 searching for a solution came across this thread. What did you end up using for wire wrapping?
           
        • 69 GTX

          69 GTX FBBO Gold Member FBBO Gold Member

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          There is a material type tape that looks like the engine bay tape. It's made by Coroplast. I use it at work for harnesses. If you'd like more info PM me.
           
        • 69 GTX

          69 GTX FBBO Gold Member FBBO Gold Member

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          tape.jpg
           
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