MSD 6AL Wiring

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Alexhetti

Alexhetti

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I'm pretty confident on how to wire up the MSD 6AL box, I just have one question concerning the ballast resistor. For those of you who bypassed the ballast (2 terminal), what gauge wire would you make the jumper to connect the two spade connectors? Seems like a small thing but the fewer burnt wires the better lol
 
Rule of thumb is "same size as there." 16 or 14 would be fine. There is less load using an MSD because the ignition wire just becomes a "trigger" (small red to the MSD)

Make SURE with your MSD that you connect ONLY the MSD wires to the coil. No tach, and no radio capacitor

If you are using a magnetic trigger dist. Make sure the "rotor phasing" is correct
 
67Dart273 said:
Rule of thumb is "same size as there." 16 or 14 would be fine. There is less load using an MSD because the ignition wire just becomes a "trigger" (small red to the MSD)

Make SURE with your MSD that you connect ONLY the MSD wires to the coil. No tach, and no radio capacitor

If you are using a magnetic trigger dist. Make sure the "rotor phasing" is correct
Click to expand...
Okay good to know, I"ll grab some 16 ga wire! But yes, the orange(+) and black(-) from box will be the only thing on the coil. I have a mopar distrubutor, so by phasing you do mean that the green(-) from from box goes to to black(-) on dist and violet(+) goes to orange(+) on dist, correct?
 
Don't go just by color, pay attention if it runs rough actually check it. Google "rotor phasing" and you'll see. If the magnetic pulse is reversed it changes the spart event in relation to the cap tower contacts and causes crossfiring.
 
67Dart273 said:
Don't go just by color, pay attention if it runs rough actually check it. Google "rotor phasing" and you'll see. If the magnetic pulse is reversed it changes the spart event in relation to the cap tower contacts and causes crossfiring.
Click to expand...
Just googled it (sorry I'm a newbie to this stuff). Just to clarify, so you're saying if it's wired incorrectly from the distributor it'll cause crossfiring because the phasing would be shifted? I was mainly basing my wire color selection via the MSD supplied schematic that includes a mopar distributor.
 
Yes, what it does is the pulse changes polarity (if it goes first neg, then pos, it flops with the pos first and neg last) Only one polarity of the complete pulse triggers the box so if it flips this changes the timing in relation to the pickup and the contacts in the cap, so the spark "moves over" and fires BETWEEN the cap contacts

There is a YouTube movie or two about this....... Just be aware, and if it runs rough, "suspect." The MSD video talks about an adjustable rotor. In this case we are only talking abour reversing the pickup wires

 
67Dart273 said:
Yes, what it does is the pulse changes polarity (if it goes first neg, then pos, it flops with the pos first and neg last) Only one polarity of the complete pulse triggers the box so if it flips this changes the timing in relation to the pickup and the contacts in the cap, so the spark "moves over" and fires BETWEEN the cap contacts

There is a YouTube movie or two about this....... Just be aware, and if it runs rough, "suspect." The MSD video talks about an adjustable rotor. In this case we are only talking abour reversing the pickup wires

Click to expand...

Funny, I actually watched that when you told me to google it! I’ll make sure to inspect those connections if it feels rough. I might just use crimp connectors to test it out and make sure the pulse is correct before soldering in the connections
 
67Dart273 said:
Yes, what it does is the pulse changes polarity (if it goes first neg, then pos, it flops with the pos first and neg last) Only one polarity of the complete pulse triggers the box so if it flips this changes the timing in relation to the pickup and the contacts in the cap, so the spark "moves over" and fires BETWEEN the cap contacts

There is a YouTube movie or two about this....... Just be aware, and if it runs rough, "suspect." The MSD video talks about an adjustable rotor. In this case we are only talking abour reversing the pickup wires

Click to expand...

Hey man wanted to thank you! Install went great. When I went to start it up... crossfiring... Knew exactly what it was, flipped the distributor wires and BOOM, running better than ever. Appreciate your advice!
 
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