Duraspark problem
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Duraspark problem
Hello Forum members. This is my first post and I need your wisdom in troubleshooting a Duraspark system. Old box was replaced as ran it without a ballast resistor and the switching transistor melted.
Have new module, new picku, new coil and new wiring throughout and a 1.3 ohm ballast resistor on the coil positive. The strange thing is that once the black ground wire is connected, the reisistor gets red hot and burns out. Thsi is so even with another new module. All the wires are out of the truck harness and run directly between battery supply, module, distributor and coil. Why would I get current flow through the coil supply with the ignition on if the module is only grounds the coil on run? I have checked the system with an oscilloscope and confirmed that there is no coil switching with the black wire disconnected from ground as expected, but if I connect it the resistor just heats up and blows. Seems as though the switching transistor in the module is grounded once the module is powered up, which is very strange.
Thanks
David
Have new module, new picku, new coil and new wiring throughout and a 1.3 ohm ballast resistor on the coil positive. The strange thing is that once the black ground wire is connected, the reisistor gets red hot and burns out. Thsi is so even with another new module. All the wires are out of the truck harness and run directly between battery supply, module, distributor and coil. Why would I get current flow through the coil supply with the ignition on if the module is only grounds the coil on run? I have checked the system with an oscilloscope and confirmed that there is no coil switching with the black wire disconnected from ground as expected, but if I connect it the resistor just heats up and blows. Seems as though the switching transistor in the module is grounded once the module is powered up, which is very strange.
Thanks
David
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Joined: Dec 2003
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From: Saskatoon, Saskatchewan
Hello and welcome David.
Drop into the Explorer, Sport Trac, Mountaineer & Aviator forum: https://www.ford-trucks.com/forums/forum32/ for help in troubleshooting the Duraspark system.
Be sure to visit the FTE International Chapter here: https://www.ford-trucks.com/forums/forum141/
Drop into the Explorer, Sport Trac, Mountaineer & Aviator forum: https://www.ford-trucks.com/forums/forum32/ for help in troubleshooting the Duraspark system.
Be sure to visit the FTE International Chapter here: https://www.ford-trucks.com/forums/forum141/
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Problem Sorted
Sorted out the Duraspark problem. Turns out our technician had fitted an extra wire on the kill relay, which supplies battery power to both the coil and Duraspark unit, causing overvoltage. Once this was removed from the circuit, there was brilliant spark with keyon/off.
Thanks for your help
I have the oem troubleshooting document from Ford if anyone needs it.
David
Thanks for your help
I have the oem troubleshooting document from Ford if anyone needs it.
David
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