Hey everyone, while searching for a MSD and 2 step wiring diagram I found a few threads that were very useful. However, most of these threads have more relays and wiring than I thought necessary for this setup. I was able to set up the 6AL box on the leading coils with a 2 step with 1 relay to cut the 2 trailing coils out so I figured I would share this info.
First off, I am not good with drawing wiring diagrams on a computer, but I will do my best to explain everything.
Alright, first thing I did was mount the MSD and 2 step in the drivers side rear bin. Obviously this requires extending wires to the engine bay so I bought 10 ft. of trailer wire that has 6 14 gauge wires loomed together. I also bought 1 single pole double throw 5 pin relay. I ran the wire up through the firewall and began splicing and cutting.
Now as far as wiring goes I followed the illustrated picture for the leading coil in this thread. https://www.rx7club.com/showthread.p...ht=msd+install
So that takes care of 4 of the 6 wires.
The next wire I cut was the power wire to the trailing coils and sent that back to pin 87a on the relay (this is the wire from the coil not the igniter)
The 12v source from the igniter goes to pin 30 on the relay and also has a jumper wire from pin 30 to pin 86 to give the relay its power
The next wire from the loom goes from pin 85 to the blue and white wire on the bottom clutch switch (this switche grounds to the relay when the clutch is depressed)
The final wire for the relay goes from pin 87 to the red wire on the 2 step.
So basically when you are driving normally with the clutch out there is power to everything minus the 2 step. When you press the clutch in, the relay takes power from the trailing coils and gives it to your 2 step. So your 2 step activates and your power is cut on the trailing coils all with 1 relay.
If this has been wired like this before and already written up I apologize but I just couldn't find it.