Where is the ignition module on a 1989 ford F-350?

The 1989 Ford F-350's ignition module isn't a single, easily identifiable box like in some vehicles. Instead, the ignition control module (ICM) is integrated into the distributor itself. Therefore, you'll find it inside the distributor. The distributor is located on the engine, usually near the front, but the exact position depends on the engine type (e.g., 6.9L diesel, 7.3L diesel, or gasoline V8).