Duraspark/HEI swap help


lilbdfrd

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Yes, thats usually the case
Ok thanks !!! So the purple that went to the yellow wire originally goes to yellow on coil for power “on” right?
 


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lilbdfrd

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Yes, that can be the case

But its usually Red + and Green -

Not familiar with yellow being used as +, but never had a 1984 Ranger

And just FYI coil "-" is not a ground per say it is the control signal that sparks the coil
Coil gets 12volts with key on, on "+" terminal
The distributor/module connect and disconnect the "-" terminal to spark the coil, it sparks every time it is disconnected
"-" is used because when there were points inside a distributor it was just easier to use "-" than "+" because of possible shorts
The points connected and disconnected "-" on the coil
This type of Electronic ignition just replaces the points opening and closing with transistor opening and closing to cycle "-" terminal on the coil, so no moving parts to wear out, although these can wear out, :)
Here is a picture of the plug in on the side of my coil!
 

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RonD

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Dark green was common color for "-" on TFI systems

But only seen red on "+", as said

You could just unplug them and use a test light or volt meter
 

lilbdfrd

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I used a muilti meter and checked every wire coming out of the main 6 wire harness and I had NO voltage anywhere while the key was in the on position! I even to a wire straight from the + battery terminal over to the “hot” side of the coil and still had no spark😪. Any other ideas ? The engine cranks great!
 


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