I've finished the mods for my v2.2 MS that's going into my stock '91 miata. I just need to take care of the harness now.

I have the diyautotune's 18" pigtail wiring harness and it has 2 identical wires for IAC1A and IAC2A (both blue / white labeled IAC-A). Also IAC1B and IAC2B are also identical green/white wires (labeled IAC2B).

My question is how do I wire this into my factory wires?

I need to find out which wire is IAC1A to wire to the secondary CAS (white)
and which wire is IAC2B to spark out B brn/yel...

Should I bridge them all together? (both blue/white to white on factory harness, and both green/white to brn/yel on the factory harness)

Do I really have to open up my harness to find out which db37 pins they're in?

Thanks in advance.

 

Yes, don't bridge them, they're different outputs on the PCB.

Really it's 2 screws to remove the connector, it's not the end of the world!

 

multimeter will help you figure out the wires in a snap.