To find the correct wire, you must consult a wiring diagram specific to your E-150's year, engine, and options. These diagrams are available through several sources:
* Factory Service Manual: This is the most reliable source. It will provide a detailed wiring schematic.
* Online Repair Manuals: Sites like Chilton or Haynes offer repair manuals (often available for purchase) that may include wiring diagrams. Be sure to select the correct year, engine, and options when choosing a manual.
* Automotive Parts Stores: Many auto parts stores (like AutoZone, Advance Auto Parts, etc.) have access to wiring diagrams through their computer systems. They may be able to look up the information for you.
Attempting to identify the ignition wire based on color alone without a wiring diagram is risky and could lead to damage to your vehicle's electrical system. Always use a wiring diagram for safety.
