Hello everyone allow me to give you a little bit of history before i ask my question. After five years or searching i finally bought my first rx-7. It is a 85 with the 12a and clearly someone has been trying to get it to run before i acquired it. I have it running but the Tachometer will not. I have a MSD 6A Ignition Control Box and the wires to the dizzy when wiggled got the tach working but no more. the igniter is long gone but last night i directly wired the dizzy wires to my msd wires ( green and purple) and still nothing. My question is what the hell am i missing is the dizzy suppose to ring out with a meter? I am at a loss at this point any help is greatly appreciated.

 

How do you have the tach wired to the coil?

MSD 6A direct fire Ignition for Mazda RX-7 Rotary Engine ? Dr. Scott M. Baker

 

Great question i have no idea. i have a 3rd red wire of the msd connected to the cars harness. but i have no idea what im looking for.
Tachometer = a mystery wire

 

Time to compare your wiring to that of the factory configuration. Also a good practice to make a schismatic of what you have.

The factory service manual can be found here. http://foxed.ca

 

thank you for the hyperlink i now know what i'm looking for. Now all i need is time to work on it.

 

Ok so my tach does make up to the secondary coil and i now, and I have it working ........ kinda. its a bit erratic.
My new question is how does one go about fixing the secondary due to failure to ignite. Based on your advice i have it wired up correctly. I had to connect directly from msd to the wiring harness and secondary coil.
All helpful questions are appreciated