* Integrated into the distributor: This was common on many engines of that era. If your truck has a distributor, the ignition module is likely *inside* it and not a separate component. You wouldn't be able to easily replace it without replacing the whole distributor.
* Separate component mounted on the firewall or near the distributor: Some engines, particularly those with HEI (High Energy Ignition) distributors, might have a separate ignition control module (ICM) mounted externally. Look near the distributor, on the firewall, or possibly under the hood near related wiring.
To find it, you'll need to:
1. Determine your engine type: Look for an engine code on a sticker under the hood (often near the radiator support) or in your owner's manual. Knowing the engine (e.g., 305, 350, 4.3L) will help you find a diagram specific to your truck.
2. Consult a repair manual: A Haynes or Chilton repair manual for your specific year and model Chevy pickup will have a detailed diagram showing the location of all components, including the ignition module (or its integration within the distributor). This is the best way to be certain.
3. Use online resources: Websites like GM-Trucks.com or other online forums dedicated to Chevy trucks might have information or photos specific to your engine. Search for your year, model, and engine type, including phrases like "ignition control module location."
Without knowing your specific engine, it's impossible to give a precise location. Use the steps above to track it down reliably.
