any wiring experts here?
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Senior User
Joined: Nov 2004
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any wiring experts here?
i have retrofitted a duraspark system to my '65 everything works well. but i was wondering what is the resistance of the coil wire (positive, red wire green stripe) i may have to change it to match what the donor truck had.
Elder User
Joined: Aug 2007
Posts: 516
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From: Milwaukie, Oregon
shouldnt really amtter as long as it works and has a good spark. this is how aftermarket companies change the quality of spark my adding more coils or less. changing the resistance of the coil.
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Senior User
Joined: Nov 2004
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ya it does run well. but i want to make sure that i am supplying the box and coil with the aproprate voltage. i suspect that the resistance value in the old truck is close enough to the donor truck (1-1.15 ohms i am told)
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
The wire color coded red with green stripes was not available until 1974.
COLF12250A .. Resistor Wire, Ignition Coil (Motorcraft DY37)
61.50" long / Color coded PINK / 1.30 - 1.40 ohms resistance / #20 gauge wire.
Fits: ALL 1960/73 Cars/Trucks.
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D7AZ12250A .. Resistor Wire-Ignition Coil (Motorcraft DY213)
49" long / Color coded RED with GREEN Stripes / 1.30 - 1.40 ohms resistance / #16 gauge wire.
Fits: ALL 1974/86 cars/trucks with DuraSpark electronic ignition.
DuraSpark was introduced in 1974.
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Senior User
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ND: yes the truck has a red wire (dirty must have gotten the stripe colour wrong) that once went to the positive post on the coil. when i snipped the DS harness out of the '80 there where only 3 wires that didn't go to the DS or the coil or the distributor. two came off of the box one red and one white with blue stripe. the other red with a stripe came off of the coil conector. it was this one that i hooked to the origional coil wire. since the ohm value matches between '65 and '80 i will leave it alone.
Thank you for looking that up for me. i will sleep better knowing its hooked up right!
I think this is a good upgrade. all the parts are ford and look like they belong!
Thank you for looking that up for me. i will sleep better knowing its hooked up right!
I think this is a good upgrade. all the parts are ford and look like they belong!
