MSD 6AL location?

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  1. Moparlike

    Moparlike Active Member

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    1E21AC2C-F40D-47A4-8C3B-C0892F405403.jpeg Hey.
    The previous owner of my 69 Road Runner 440-6 mounted the MSD behind the rear seat. The battery location is in the trunk.
    It seems too far back.... should I move the 6AL forward, and what is the ideal location?
    Stay safe!
    Thanks!!!
     
  2. RPMagoo

    RPMagoo Well-Known Member

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    Hmmm ! --- :popcorn: ---
     
  3. Jessejames

    Jessejames Well-Known Member

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    Yikes. interested to see how the coil wire was routed. I know the big thing is the box gets hot and needs ventilation.
    I always mount mine on the passenger side inner fender well. And mount my coil near by. Just has a clean look with minimal wires.
     
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    • coloradodave

      coloradodave Well-Known Member

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      I mounted mine inside my car, high on the right side kick panel. Stays cool, dry and it's easy to change the rev limit. Don't even notice it's there.
       
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      • ruffcut

        ruffcut FBBO Gold Member FBBO Gold Member

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        Yea. most of us would mount it inside the car on the right side somewhere. Mine is mounted on the firewall just below the glove box. Out of sight but easy to get to.
         
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        • 33 IMP

          33 IMP Well-Known Member

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          I've got two msd 6al's, and an ancient mallory box that still works great. All three are mounted high on the toeboard on the passenger side, inside the pass compartment. For exactly the reasons Colorado Dave and Ruffcut mentioned.
           
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          • Mike Gaines

            Mike Gaines Well-Known Member

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            My placement on my 64 Belvedere Hemi Car is at the passenger side. It's a 7AL-3 but placement is same as 6AL

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            • 66Satellite47

              66Satellite47 FBBO Gold Member FBBO Gold Member

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              With that placement, I'd be worried about the voltage drop on the trigger wires and coil power wires. I'm happy with my setup on inside of the firewall.
               
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              • Dodge 330

                Dodge 330 Well-Known Member

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                Mine is hidden under the battery tray in the engine compartment. Very close to all the connections to be made, stays cool, accessible and fits very well there. Best of all? No one notices.
                 
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                • 383man

                  383man Well-Known Member

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                  I just got a digital MSD6AL unit and I am mounting it here under the hood. What I am doing is running a ground and pos battery cable from my trunk mounted battery to these two stud post I mounted on my firewall. That way I can pick up my hot and ground for the MSD right under the hood. And I will also use the hot to feed the car and ground the ground stud to the block and body. Ron

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                  • dvw

                    dvw Well-Known Member

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                    I see no reason it wouldn't work. The most important factors are A; good power feed and ground to the box. B; good shielded wiring to the distributor/crank trigger and the coil. C cool location. Whats not to like? I've mounted them under the front battery tray, glove box area. Never had an issue in those locations either. At a bare minimum the harness to the coil and trigger device should be twisted. I personally like wire with shielding grounded to the box itself (one end only). You'll seethe top harness has a 3rd wire going down the right side of the box to the ground nut at the lower front corner. This is the shield for thecrank trigger harness. It acts as a antenna. any stray signal goes right to ground.
                    Doug

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                    Last edited: Apr 23, 2020
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                    • mrhemi

                      mrhemi Well-Known Member

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                      I have mine hidden inside, behind the radio delete plate. Gets convection cooling up through the empty speaker grille.
                       
                    • coloradodave

                      coloradodave Well-Known Member

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                      No hinges are a plus, Ron...lol.
                       
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                      • Brewzer67

                        Brewzer67 Well-Known Member

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                        I put mine where the battery used to be. Easy to get at all the dials and it's up out of the high heat areas. It also stays dry when I get caught in the rain.

                        Engine_MSD_Location.jpg
                         
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                        • LemonWedge

                          LemonWedge Well-Known Member

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                          Mine is exactly opposite of where Brewzers’ is (passenger side). I have read from MSD that they recommend “somewhere the box will get airflow; NOT in the glove box because they get no airflow there for cooling”. It’s the only place they mention specifically, so I’m guessing they’ve seen multiple failures with them there (??).
                           
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                          • 383man

                            383man Well-Known Member

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                            Yea your right as it would not fit there with hood hindges. That's one plus for a glass hood. Ron
                             
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                            • 66Satellite47

                              66Satellite47 FBBO Gold Member FBBO Gold Member

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                              If it's mounted in the passenger compartment it's not exposed the higher heat of the engine compartment. I believe that engine compartment heat is what MSD is concerned about.
                               
                            • beanhead

                              beanhead Well-Known Member

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                              Not an MSD but my FBO box is mounted on the inside on the firewall. It's up far enough it's outta sight but I don't have a heater box..
                              What I did do though, is used some standoffs to space it away from the firewall. I also cut a piece of thick industrial piping gasket material (Gylon) the same size as the box and put that under the standoffs, right against the firewall because even the inside surface gets a little hot to the touch after driving. The cooler the better...
                               
                            • dvw

                              dvw Well-Known Member

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                              Think about voltage drop when the battery is in the trunk? Same distance.
                              Doug
                               
                            • 6PKRTSE

                              6PKRTSE Well-Known Member

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                              I have always mounted them under the battery tray in the engine compartment. My current set up, MSD Grid, RacePak data logger, fuse/relay panel, 4 stage nitrous controller are all mounted under the dash on the knee bar.

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                              Last edited: Apr 29, 2020
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