Duraspark I conversion

[rae61]

I'm placing a duraspark I out of a 75 mavrick into my 71 Bronco with a 170. I went with a I vs II since it will fit better
due to my power steering pump bracket.

With a duraspark II you have a red and a white wire from the module but on the duraspark I there is a red a white and a blue, so how do you hook this up. I have done some searching but have not found an answer yet. I have my own ideas but I dont want to fry anything, but I'm sure someone on here has the answer to this.

Thanks.

 

[Explorer]

Does this help?

 

[rae61]

Yes that diagram is big help, Thanks!

 

[rae61]

So it looks like the Red and Blue are pulling off the same wire just on opposite sides of the ballast resistor, I would guess that is so you get the full 12V on start-up
and then it pulls from down stream of the resistor so you are getting lower voltage so less heat and ware on the coil and sparkplugs, does this sound right??

 

[Explorer]

Correct, except it has no effect on the sparkplugs. Coils are made diff with some requiring the ballast resistor and some not. If you use a coil that needs it and no resistor and you will burn it up shortly.

 

[rae61]

I just finished installing the duraspark on the 170 I6 in my Bronco and what a difference!! It starts quicker, idles and runs way better, what a great upgrade for so little
money. :mrgreen: