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Ignition Fault.....Somewhere!

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  • #16
    Re: Ignition Fault.....Somewhere!

    With Regards to earthing , I always run a braided earthing strap bolted to the bell housing and the other end directly onto the negative terminal of the battery.

    they are available in different widths and lengths e.g https://www.ebay.co.uk/itm/Car-Engin...MAAOSwl8VdljSE

    That type of earthing strap will help with using the starter to crank the engine, as well as improve the intensity of the spark to the plugs.

    Because they don't have insulation on here are some of the advantages:

    1) The condition of the cable can be clearly seen and monitored.

    2) They are very flexible , so provided the correct length is selected are unlikely to be damaged by engine vibration and movement.

    3) When either charging your battery or using an ignition timing light they are a handy place to use the crocodile clips on for your negative connection.


    With Regards to Scotty's car issue , as he has an intermittent fault that appears to be related to items when using the ignition, it may be possible that there is a connecting plug that joins the loom after the ignition switch possibly behind or under the dash. So that should also be checked. It may simply be a corroded connector that needs unplugging and spraying with contact cleaner considering the age of the car.

    All Marlins are individually built and how the car was wired can vary greatly, so in reality nothing can be ruled out as to the cause, but agreed earthing is the starting point.


    Interestingly when I rebuilt my Roadster it had quite a few problems with the electrics and of the 8 problems only 1 of them was earth related.

    For that earthing problem I added a smaller sized braided strap that took an M6 bolt, from the wiper motor casing to the metal body work to increase the wiper speed.
    Last edited by Ye Ol Ripper; 22-10-20, 08:18 AM.

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    • #17
      Re: Ignition Fault.....Somewhere!

      Whatever you do, don’t let the smoke out!
      MOC member since 05/97
      1984 Marlin Roadster SWB.
      1800TC, Unleaded ported head, stage 2 cam. Ford Type 9 gearbox, Dolomite Sprint rear axle fitted with MGF disc brakes.
      Three core radiator, Renault Clio vented front discs.
      The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

      Loads of Marlin Reference can be found documents here or there.

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      • #18
        Re: Ignition Fault.....Somewhere!

        Replacement smoke is available part number 530433 or 530434 (pos or neg earth?) and the Churchill insertion tool 18G 548BS.
        When working with caravans in the '70s we always had a long earth lead to check the earth. Most of the time that was where the fault was. On my S1 landrover, I have a body panel that has no electrical connection with the rest of the vehicle. If you have a master switch that should also be suspect.

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        • #19
          Re: Ignition Fault.....Somewhere!

          I just googled that first part number. http://www3.telus.net/bc_triumph_registry/smoke.htm I hadn't realised this was available. I could have saved myself some time with this. I just rewired my Roadster. I wish I had known about this sooner.

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          • #20
            Re: Ignition Fault.....Somewhere!

            Originally posted by HairyDave View Post
            Replacement smoke is available part number 530433 or 530434 (pos or neg earth?) and the Churchill insertion tool 18G 548BS.
            When working with caravans in the '70s we always had a long earth lead to check the earth. Most of the time that was where the fault was. On my S1 landrover, I have a body panel that has no electrical connection with the rest of the vehicle. If you have a master switch that should also be suspect.
            I have a long length of wire in my toolbox with a crock clip at both ends for debugging earths...
            Mk2 SWB Marina Roadster with a 2.0L Pinto built in 1986

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            • #21
              Re: Ignition Fault.....Somewhere!

              Originally posted by andyf View Post
              I have a long length of wire in my toolbox with a crock clip at both ends for debugging earths...
              Same here, with a fuse holder in the middle....not that I'm overly cautious!
              - 9th owner of T693 SSC possibly a factory built Ford based V8 Sportster
              - 4th owner of Q309 RNV, an early Cabrio built by Bob Copping, owned Doug & Liz Billings for 16 years
              - 9th Custodian of JRR 929D, Triumph Vitesse based special Paul Moorehouse built prior to the Triumph Roadster kits.
              - 8th owner of Roadster chassis number 2395. Now owned by Barry!
              - Builder of chassis number 2325 (PKK 989M) in the mid 80's. Now owned by Eric & Lynne.

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              • #22
                Re: Ignition Fault.....Somewhere!

                Originally posted by David View Post
                Same here, with a fuse holder in the middle....not that I'm overly cautious!
                What do you mean the sparks are the best bit. Once managed to vaporise a complete spade when I accidentally created a short, it left a gold dust everywhere
                Mk2 SWB Marina Roadster with a 2.0L Pinto built in 1986

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                • #23
                  Re: Ignition Fault.....Somewhere!

                  That reminds me my dad once decided to shorten the lead on a standard lamp using a Stanley knife, trouble is he took the knife to the wrong lamp, and it was switched on, big blue flash in the lounge!
                  - 9th owner of T693 SSC possibly a factory built Ford based V8 Sportster
                  - 4th owner of Q309 RNV, an early Cabrio built by Bob Copping, owned Doug & Liz Billings for 16 years
                  - 9th Custodian of JRR 929D, Triumph Vitesse based special Paul Moorehouse built prior to the Triumph Roadster kits.
                  - 8th owner of Roadster chassis number 2395. Now owned by Barry!
                  - Builder of chassis number 2325 (PKK 989M) in the mid 80's. Now owned by Eric & Lynne.

                  Comment

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