Tools You'll Need:
* Wrench(es): You'll likely need a wrench or socket set to remove the coil mounting bolts. The size will depend on your specific vehicle, but common sizes are 7/16" or ½".
* Screwdriver (possibly): Some coils might have a mounting bracket secured with screws.
* New Ignition Coil: Make sure you get the correct replacement coil for your 1970 Chevy model. Auto parts stores can help you find the right one based on your engine type.
* Gloves: Protect your hands.
* Wire Brush (optional): To clean any corrosion from the coil mounting area or terminals.
* Needle-nose pliers (optional): To help with wire connections.
* Wires or Wire Connectors (optional): In case any of the connections are damaged.
Steps:
1. Disconnect the Battery: This is crucial for safety. Disconnect the negative (-) battery cable first.
2. Locate the Ignition Coil: The coil is usually located on the engine's firewall or near the distributor. Consult your vehicle's repair manual for the exact location if you're unsure. It's a roughly cylindrical component with high-voltage wires connected to it.
3. Disconnect the Wires: Carefully disconnect the wires attached to the coil. There will be at least two:
* High-voltage wire: This is the thick, heavily insulated wire that goes to the distributor cap. Make a note of which terminal it goes to.
* Low-voltage wires: These are usually thinner wires, often two, connected to the coil's positive (+) and negative (-) terminals. These are the 12V power and ignition switch connections. Note where these go as well. Take a picture if it helps.
4. Remove the Coil: Unscrew or unbolt the coil from its mounting bracket. Sometimes, there might be a retaining clip. Carefully remove it without damaging the coil or the surrounding components.
5. Clean the Mounting Area: Use a wire brush to clean any corrosion or dirt from the mounting surface on the engine block and the coil base. This ensures a good connection for the new coil.
6. Install the New Coil: Mount the new coil in the same location as the old one, ensuring it sits securely in the bracket. Tighten the bolts or screws appropriately.
7. Reconnect the Wires: Carefully reconnect the high-voltage wire and low-voltage wires to the appropriate terminals on the new coil. Ensure the connections are secure.
8. Reconnect the Battery: Carefully reconnect the negative (-) battery cable.
9. Test the Ignition System: Start the engine and test to ensure it runs properly. Listen for any unusual sounds, and check for any misfires or rough idling. If it doesn't start, double-check all connections.
Important Notes:
* Consult a Repair Manual: A factory service manual for your specific 1970 Chevy model is highly recommended. It will provide detailed diagrams and instructions specific to your vehicle.
* High Voltage: Remember that the high-voltage wire carries a significant electrical charge. Avoid touching it when the engine is running or the ignition is on.
* Safety First: If you're not comfortable working on your vehicle, take it to a qualified mechanic.
This guide provides general steps. Variations may exist depending on your specific engine and model. Always refer to your vehicle's repair manual for the most accurate instructions.
