To locate the coil for cylinder #1, you'll need to:
1. Consult your owner's manual or a repair manual: These will usually have a diagram showing the firing order of the cylinders and the location of the spark plugs and coils. The firing order dictates which cylinder fires first, second, and so on.
2. Identify Cylinder #1: This is usually located at the front of the engine, on the passenger side (but this can vary slightly depending on the engine). Your repair manual will be the definitive source for your specific engine.
3. Locate the coil above Cylinder #1: Once you've found cylinder #1, the ignition coil sitting directly above it is the one for that cylinder.
In short: There's no single "Ignition Coil 1" label. You need to identify Cylinder #1 visually and find the coil above it. A repair manual specific to your 2004 F-150's engine is crucial for accurate identification.