Does anyone have a diagram or can someone please explain how to wire the 1st gen dizzy to the 2nd gen. I switched the stock s5 FI set up to a Holley Carb and needed to replace the cas. I want something to refer to as I wire this thing up. Thanks!
BTW: Pics would be great!

 

Its incredibly easy, The + on the igniter goes to the + on the coils, the - on the ignitor goes to the - on the coils, and you connect switched power to the + on the coils

 

You the man Tom! Just wanted to make sure that was the case.

 

Oh yeah, and if I remember right the tach pickup goes to the - on the trailing coil

 

Tach pickup can come from either one.

The only reason Mazda put it on the trailing was so that you'd know if the trailing ignition quit. If the leading stops working, the effects are quite obvious, but you could drive with no trailing and not know the difference.

 

Oh yeah, I guess the only time leading vs. trailing would matter for RPM reading would be on a direct fire leading system. Then leading would read 2x what it should be

 

Still two pulses per revolution, so it still reads correctly

Oh, wait! Where does the FC get its tach signal from? FC trailing coils are only one pulse per revolution. I'm stuck in a 1st-gen frame of mind.

 

I dont remember, but if the tach reads wrong then he knows it connected to the wrong coil

 

That's kind of the point though. On a distributor, both coils fire with the same frequency.

 

...

 

FCs get the tach signal from the trailing coil.

 

lol! Finally got it wired up, ready to go.... now the f'ing doors are locked and wont open up w/ the damn key!!!! Gotta love these cars!!! lol

 

Thats what the hatch is for!

Good luck with that problem

 

FC ignitor has a tach output wire. It contains both pulses.

 

Never had the hatch key when I got this car!