Guys, have you ever fabricated your own ignition cables?

Electrical and Ignition

  1. cruiser

    cruiser Well-Known Member

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    Gentlemen: I'd like to try making my own ignition cables for my 1974 slant six. Have you ever made up your own ignition cables? Looks like NAPA will sell you the raw cable, the clips at both ends, and the boots. Do you need a special tool to strip the cable and attach the clips at the distributor and spark plug ends? Did you use 7mm or 8 mm cable? Any online videos about doing this? Did you like the result? I can't seem to buy the correct cables for my car anywhere. They sell the correct length, but the rubber spark plug boots are all wrong. Any help is appreciated. Thanks - BOB
     
  2. Dana67Dart

    Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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    Has been done since spark plugs wires have been in existence.

    A proper crimping tool will make short work of it but you can do it without.

    No special cutting tools needed
     
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    • cruiser

      cruiser Well-Known Member

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      Thanks. How do the boots go on? How do you install the 90 degree boots that come off the distributor cap? Do you any particular brand of wire?
       
    • RustyRatRod

      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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      Of course. Used to be, ready made plug wires were very expensive. Parts stores sold plug wire in bulk off rolls and you just bought however many feet you wanted, picked out your boots, got the ends and crimped them on.
       
    • abodyjoe

      abodyjoe Well-Known Member

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      very easy job to do... do yourself a favor and buy the proper ratcheting crimp tool.. makes the job a million times easier and faster.
       
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      • abodyjoe

        abodyjoe Well-Known Member

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        fast forward to 1:37
         
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        • 67Dart273

          67Dart273 FABO Gold Member FABO Gold Member

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          • Dana67Dart

            Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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            1. Put boot on wire (watch orientation)
            2. Strip appropriate amount of insulator from end (try to not cut the conductor)
            3. Fold conductor backwards over the insulator
            4. Crimp on terminal with conductor opposite the crimp.
            5. Slide boot over terminal ( if you need to lube the boot be sure the lube is NOT electricly conductive.
            6. Rinse and repeat the other end
             
            Last edited: Dec 7, 2020
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            • cruiser

              cruiser Well-Known Member

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              What's the difference between 7mm and 8 mm ignition cable? Will either work on my slant six?
               
            • Tooljunkie

              Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

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              I dont think the larger wire will go into distributor cap.
               
            • MoparMike1974

              MoparMike1974 FABO Gold Member FABO Gold Member

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              MSD sells some really nice wire sets that have one end on and you cut to length and install the other end. Its really low resistance wire. I bought the msd crimpers and they work like a champ.
              I always hated pre-made wires because they never fit like they should. This way you can route them however you want and they fit like a glove. I will post some pics and part numbers if I can find them.
               
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              • CRUZE 418

                CRUZE 418 FABO Gold Member FABO Gold Member

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                Makes a difference if you are electronic or points too, for wire type. Several kits have a crimper with the wire kit, just use it in your vice for crimping, no need to buy special wire crimper.

                1607386908692593336611.jpg
                 
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                • moparmarks

                  moparmarks zippindippintie FABO Gold Member

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                  Yep been making my own since the 70's. I like a custom fit. I had a bunch of new MSD stuff so made these for my Dart and also for my Satellite. Both are 8mm.

                  20200402_161730.jpg

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                  20160726_114742.jpg
                   
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                  • MoparMike1974

                    MoparMike1974 FABO Gold Member FABO Gold Member

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                  • Dana67Dart

                    Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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                    For your stock or close to stock ignition system 7mm will be fine. The larger are for race type ignition systems, more insulating ability maybe even bigger conductor.

                    Be sure you buy resister core wire or don't plan on listening to a radio within 20 feet.
                     
                  • 70chall440

                    70chall440 Mopar or No Car...

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                    I always make my own, I hate the pre-made ones, they are either too long or too short.
                     
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                    • mopardude318

                      mopardude318 Well-Known Member

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                      • RustyRatRod

                        RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                        8mm is 1mm bigger than 7mm.

                        In short, the bigger diameter cable offers more protection from spark "leakage". Also IF the center conductor is bigger, it also offers a path for more current to the plug.
                         
                      • famous bob

                        famous bob mopar misfit

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                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^better for electronic ign, too.
                         
                      • 69_340_GTS

                        69_340_GTS Well-Known Member

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                        • Thanks! Thanks! x 1
                        • 383Scampman

                          383Scampman Well-Known Member

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                          Yes they will . You may need a crimping tool . I have one sold by Moroso . It cuts the cable and has different jaws for crimping the ends . I didn't know building ignition could be so easy . Almost fun .
                           
                        • 69_340_GTS

                          69_340_GTS Well-Known Member

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                          The wire size doesn't matter. The terminal ends attached to the wire are what plug in to the cap.
                           
                        • Blucuda413

                          Blucuda413 Well-Known Member

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                          When I first got started in the 50's that's what you had to do if you wanted anything custom. I hauled a roll of "Packard" wire around for years until I finally threw it away. I believe I still have a set of Rajah clips for the plug ends.
                           
                        • pishta

                          pishta I know I'm right....

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                          Mallory or Taylor used to sell a 7mm ignition wire kit for a V8 at Supershops for $7.99. circa 1985. Blue cable, brass colored ends, black boots and even 'shorting pins' that looked like brass nails that you could put in the distributor end and short individually to see what cylinder balance you had. The mm is just the OD of the cable, IIRC the inside carbon core was all the same unless it was very low resistance stuff. Pre cut stuff was ALWAYS too long.
                           
                        • dogbreath

                          dogbreath Well-Known Member

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                          Total waste of time making plug wires for a slanter. None of the make yourself kits will have the correct ends that have the spark plug tube seal. AFAIK the only set that has the tube seals on the wires is denso 6716132 about $20.
                           
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