As you can see by this photo of my mounting location, the sheet metal is a little less than perfect, due to a movable Ol’ Paint coming into contact with an immovable fixed object, courtesy of the previous owner. In a nut shell, we were not getting spark out of the MSD box at cranking RPM. I will use the same method as I did when soldering the tach wire. Made both fixes, still no spark. Aaron The first wiring task I will tackle is connecting the tachometer. Since the panel that I am mounting the MSD box to will be replaced when Ol’ Paint becomes “New Paint”, I am not too fussy with perfection in the mounting. By checking the resistance of each wire you will determine two things: That there is continuity (not open) and if there is too much resistance in the wire. Our people also have some more pictures associated to Chevrolet Hei Distributor Wiring Diagram, please see the photo gallery below, click one.HEI to MSD 6AL Should I? In fact, each foot of finished wire … Spark plug wire comparison between Accel wires, MSD wires, Magnecor wires, Mopar wires, and Granatelli wires. Some tachometers need an adaptor to work properly with the box, and there is a handy Tachometer Compatibility List in the instructions that come with the box. I will get some decorative wire wrap to clean up the look in the coil area as time allows. MSD provides a wire as part of the set, so simply plug it in to the box as shown here. Another method to scribe the 4 holes that will need to be drilled can be to make a paper template with the box on your workbench, as shown here. What does every one think about this. 3. I noticed immediately that the car was much more willing to idle on cold start-up. Be careful not to over tighten, as many a good coil has been thrown away due to stripped threads on the coil posts. Now it is time to connect the box to the distributor and coil. It is important not to fully tighten them yet, as imperfect mounting surfaces like mine will make alignment with the box itself very difficult. This will prevent unexpected voltages and spark from damaging your components and you! Note: Solid Core spark plug wires cannot be used with an MSD Ignition.. Solid core wires will not suppress the higher spark output generated by the CDI. It is best to route this harness away from the two coil wires and any spark plug wires. Nobody wants extra holes in their firewall. Since the factory wires originally connected to the coil, they had eyelets on them. ... spark plug wires cannot be used with an MSD Ignition. Spark plug wires are very important to the operation of your ignition system. I called MSD today and they told me not to run the iridium plugs because they will get too hot. I have already clipped the green wire and the black wire is shown here. The top slot is the tach output terminal, for those running a tachometer, and the Magnetic Pickup Connector harness at the bottom is for those running an MSD distributor or crank trigger, factory or aftermarket magnetic pickups. And here are the wires connected directly to the battery. There are a number of wires coming out of the wiring harness connected to the MSD box. I decided to go with this type of connecter to allow for easy disconnect should I have a component failure in the future, like the Pertronix unit failing. MSD 6AL - large red wire to battery positive large black wire ... black wire to coil negative. That means I will have to splice in an extension to get the wires to reach the battery. I was wondering if you can use an MSD 6AL with the Duraspark distributor? 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