The coil primary circuits' on-off switching is through the Ford Thunderbird Ignition Control Module. This enables a correctly timed high-voltage spark that allows the engine to fire and run. Ford's original offering with a distributor was equipped with a module that opened and closed the primary circuit through a transistor whenever the reluctor passed the pickup or hall switch. In essence, the circuit replaced breaker points. It allowed switching by the module, making it possible to achieve a better spark. These Thunderbird modules turned out to be durable. This distributor-type Ignition Control Module was compatible with manually set base timing, centrifugal and vacuum advances. As later versions of the Ford Thunderbird would get rid of the distributor, an updated Ignition Control Module would work with the engine computer, running off crankshaft sensor signals. In engines, a cam sensor would determine initial timing and all advance, eliminating wear points and improving power, economy, and emissions. Every Ignition Control Module is essential. A failed Ignition Control Module means no spark and no start, regardless of version. However, simple voltage or flicker tests will help you find the fault before changing out the Ignition Control Module in any Ford Thunderbird.
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