Dura Spark question....
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From: Grain Valley Mo.
Dura Spark question....
I got the 390 running thanks to you guys. I rewired the truck with an aftermarket wiring kit. They included a resistor to run in front of the coil. They do relize it is a Dura Spark and not points. It reduces the voltage down to about 7 volts. It won't run with the resistor, but runs fine with a full 12-14 volts. They said (Ron Francis) if I run 12v it will burn out the brain box. What do you guys think? Thanks
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'53 F100
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'53 F100
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From: Colville, Washington
It depends on which version of the Duraspark you have, some use a resistor and some do not. My diagrams show a resistor from '74 to '77, after that a resistor is not used. The module should always have 12v according to my info, the resistor is only used for the coil, then Ford started using an internally resisted coil I believe.
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From: Colville, Washington
Originally Posted by xfordman
I got the 390 running thanks to you guys. I rewired the truck with an aftermarket wiring kit. They included a resistor to run in front of the coil. They do relize it is a Dura Spark and not points. It reduces the voltage down to about 7 volts. It won't run with the resistor, but runs fine with a full 12-14 volts. They said (Ron Francis) if I run 12v it will burn out the brain box. What do you guys think? Thanks
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'53 F100
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'53 F100
The Dura Spark module needs 12v to operate.
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From: North Dakota
Ya I know I had to do a major rewire of my pickup for faulty wiring, the previous owner had a huge mess. Basically what I did was hook up a new 10 guage wire direct from the coil to 12 volts. The guys at napa crossed the coil over for me so I could have a similar coil with an internal resistor. Has been working great.
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From: alaska
Originally Posted by powderspecial600_98
Ya I know I had to do a major rewire of my pickup for faulty wiring, the previous owner had a huge mess. Basically what I did was hook up a new 10 guage wire direct from the coil to 12 volts. The guys at napa crossed the coil over for me so I could have a similar coil with an internal resistor. Has been working great.
thats a neat up grade , you dont happen to remember the part number , do you? bob 
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From: Virginia Beach, VA
Originally Posted by powderspecial600_98
Ya I know I had to do a major rewire of my pickup for faulty wiring, the previous owner had a huge mess. Basically what I did was hook up a new 10 guage wire direct from the coil to 12 volts. The guys at napa crossed the coil over for me so I could have a similar coil with an internal resistor. Has been working great.
Bob
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From: North Dakota
Took a look at the part number, but it doesn't tell me a whole lot. I bought this coil at carquest. The number on it is 080. It just says right on the coil for use without an external resistor. Hope this helps.
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the only thing close to this part number. http://www.hothemiheads.com/desoto/i..._resistor.html
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The 1975 Ford Truck Shop Manual is showing, a hot wire from the ignition switch to the yellow harness (under the dash between the instrument panel and fuse box) with three outputs, the resistor wire hooks up to this yellow harness and runs toward the to the coil for the point and condenser setup on the distributor, the ignition module setup - it is also showing a hot wire from the ignition switch to the yellow harness (under the dash between the instrument panel and fuse box) with three outputs, the resistor wire hooks up to this yellow harness and runs toward the ignition module.
If your truck for some reason does not have this resistor wire, a ballast resistor or another resistor wire should be used. At most automotive parts stores a ballast resistor rated between 1.4- 1.54 ohms or a new resistor wire should be used.
If your truck for some reason does not have this resistor wire, a ballast resistor or another resistor wire should be used. At most automotive parts stores a ballast resistor rated between 1.4- 1.54 ohms or a new resistor wire should be used.
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From: Grain Valley Mo.
I hate this, but I won't lie!!!
OK, guys it's time for me to fess up, even tho I don't want to. I found the problem.... The coil 'is' suspost to run on 6-7 volts with either a resistor wire or a ballast resistor, or internal resistor coil. Mine would only run on a full 12 volts,,,,, because I had the wrong rotor in the dizzy. I had switched from a small cap to the large cap and got the rotors mixed up. That spark must have been jumping up about an inch, I swear it was running. My only defense is that many months went by sense I tore it down and stuff got mixed up.
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