Ground strap

1971 - 1974 Mopars

  1. Daves69

    Daves69 Well-Known Member

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  2. rrTor-Red

    rrTor-Red FBBO Gold Member FBBO Gold Member

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    Same one here that idrivemopar and Daves69 posted. Mine was broken and went from one of the bolts from the back of the block(somewhere in that area), to firewall but I don't have a picture.
     
  3. Nacho-RT74

    Nacho-RT74 FBBO Gold Member FBBO Gold Member

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    bolts to head provision, after the intake manifold on BB at least
     
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    • 72RoadrunnerGTX

      72RoadrunnerGTX Well-Known Member

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      To address the OP’s original question, the charging systems output ground return path is through the alternator case-block-main battery cable. Adding additional block to body connections, to systems where original block to body paths are intact, will not improve charging performance. Block to body connections are the return path for all other original loads grounded to the body. The later braided straps were originally added in various locations primarily for radio noise suppression purposes.
      BTW, Chrysler Parts had noise suppression kits back then to address radio noise warranty complaints. Meant to be dealer installed, containing various braided straps and condensers, with instructions on where to install based on model. I’ve personally added many braided straps to vehicles where they were not factory original, back in the day while working at dealers.
       
      Last edited: Mar 27, 2018
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      • rlem1977

        rlem1977 Well-Known Member

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        From Summit Racing $19.00
        Shafer's Classic Reproductions Ground Strap Kits GSK001
        ssh-gsk001_ml.jpg
         
      • Nacho-RT74

        Nacho-RT74 FBBO Gold Member FBBO Gold Member

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        index.php?action=dlattach;topic=101979.jpg
         
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        • pjm8047

          pjm8047 Well-Known Member

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          Just installed this. Will this work?

          6247BE58-1C88-49E9-971F-F955970FEF8C.jpeg
           
        • Nacho-RT74

          Nacho-RT74 FBBO Gold Member FBBO Gold Member

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          this is the location on my 74 firewall

          hoses to firewall1.jpg
           
          Last edited: Mar 27, 2018
        • pjm8047

          pjm8047 Well-Known Member

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          I see these videos on YouTube about a big 3 upgrade and how they improve charging system performance. So there just doing to waste time by doing that?
           
        • Rick62

          Rick62 Well-Known Member

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          Mopar stopped using the block to firewall ground strap when they added the wire to the battery cable from the negative terminal on the battery to the core support. One way or the other you need a ground between the battery and the body. Motor mounts and transmission mounts are usually not good conductors.
           
          Last edited: Mar 27, 2018
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          • Nacho-RT74

            Nacho-RT74 FBBO Gold Member FBBO Gold Member

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            Once again, my car got ground strap AND battery to radiator core support wire... 74.
             
            Last edited: Mar 27, 2018
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            • munger77

              munger77 FBBO Gold Member FBBO Gold Member

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              I have/use the same set up as Nacho on my 68. alternator gauge remains just about right in the middle with small variance.
               
            • rrTor-Red

              rrTor-Red FBBO Gold Member FBBO Gold Member

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              Mine has the same...'71
               
            • idrivemopar

              idrivemopar Well-Known Member

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              Its interesting you mention the Big 3, when I upgraded the sound system in my 06 GTO, yes, I know you can shoot me later but its a damn fun car, I did the big 3 because they said it would help the charging system and deal with the pull down from the sound system. It didn't really make a damn bit of difference, when I play anything that has heavy bass and play it loud, it still dims my headlights a little bit, not real noticeable, but it didn't make a difference.
               
            • Bb70charger500

              Bb70charger500 Well-Known Member

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              This is very good info .. can we get this saved somewhere for future use!

              By the way that new mopar ground strap for the ram isn't very long at all if it's the one I'm thinking of . I've never had a ground strap on my cars never caused an issue . I grounded out threw the rad support as stated above but that was really it. Maybe if you have a huge stereo system but the way I see it as long as the batt is grounded to the motor and the rad support there's nothing more that will help the cars are all solid metal it's all connected.....
               
            • ODZKing

              ODZKing Well-Known Member

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              Yep, same as mine
              WP_20160716_017.jpg
               
            • 451Mopar

              451Mopar Well-Known Member

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              Short answer, YES!
              Although the alternator is grounding through the engine block, the Voltage Regulator is grounded through its case contact with the firewall.
               
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              • 72RoadrunnerGTX

                72RoadrunnerGTX Well-Known Member

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                Again, if the original 10-gauge negative battery terminal to core support connection is intact, and VR is properly grounded to the firewall, adding another block to firewall strap will NOT change or improve anything relating to the charging system.
                 
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                • oldbee

                  oldbee FBBO Gold Member FBBO Gold Member

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                  As all the above state, it won’t improve anything; BUT you will have an extra ground for years to come. ( I once saw a Camaro locked in park because when started(with a bad grd) the eng/starter looked for a grd thru the shifter cable)
                   
                • Nacho-RT74

                  Nacho-RT74 FBBO Gold Member FBBO Gold Member

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                  if doesn't improve, doesn't hurt either :)

                  once I fixed a hard starting and ocassional starting failure deal with just a ground strap :D on an old buddy's 72 Charger ( have no idea about the radiator core support wire conditions thought just went straight to add the strap )
                   
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