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Why is there still no No spark from coil on a 1977 ford 460 after replacing?
Wiki User
∙ 14y ago
This condition suggests that there was nothing wrong with the old coil, but instead, the 12 Volt ignition system that "feeds" power to the coil is at fault.
To assist you in understanding this the following is a basic primer in coil operation.
An ignition coil is really nothing more than a transformer for increasing voltage and thus has two windings [coils] inside of it. The primary coil is energized with 12 Volts from the vehicle electrical system when the points are closed. This creates a "field" of magnetic current around the primary winding while the points are closed.
The second coil of wire inside the coil is the high voltage generating portion which feeds very high voltage to the distributor, and subsequently to the spark plugs.
When the points are closed, current flows through the primary winding creating a magnetic field. Then when the points open, the flow of electrical current instantly stops, causing the magnetic field to "collapse."
When the primary winding magnetic field collapses, it "induces" a current within the secondary [or high voltage] winding. This resulting high voltage current is fed to the distributor which determines which spark plug to send the current to.
The fact that a new coil will not generate a spark suggests that there is NO electricity getting to the primary winding in the ignition coil. This could be caused by nothing more than a disconnected, cut, or broken conductor [wire] in the ignition circuit that is supposed to feed electrical current to the coil.
The "fix" for this is to find out why there is no current flow, and properly repair the fault.
Wiki User
∙ 14y ago
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