1. Verify the New Battery Installation:
* Connections: Absolutely crucial. Double-check that both the positive (+) and negative (-) battery cables are securely connected to both the battery terminals *and* the vehicle's terminals. Corrosion can be a problem – clean the terminals with a wire brush if necessary. Make sure the connections are tight. Loose or corroded connections can prevent current flow even with a new battery.
* Cable Condition: Inspect the battery cables themselves for any damage (cracks, fraying, etc.). A damaged cable can prevent a good connection.
* Battery Terminals: Ensure the battery terminals are clean and free from corrosion. Use a wire brush and baking soda paste to clean them thoroughly.
* Correct Battery: Make absolutely sure you installed the correct battery for your Ford van. Wrong voltage or amperage will cause problems.
2. Check the Starter Motor:
* Listen for a Click: When you turn the key, do you hear a single click? This often indicates a weak battery (even a new one might have issues if it's not fully charged), a bad starter solenoid, or a bad connection to the starter motor.
* Try Jumping: If you have jumper cables and another vehicle, try jump-starting the van. If it starts, it points to a problem with the charging system or the starter motor itself. If it doesn't start, the issue may be something else entirely.
3. Check the Ignition System:
* Ignition Switch: A faulty ignition switch can prevent power from reaching the starter.
* Fuses and Relays: Check the fuses and relays related to the ignition system and starter motor. Consult your owner's manual for their location and ratings.
* Ignition Coil (if applicable): A failing ignition coil can prevent the spark plugs from firing.
4. Check the Alternator:
* Charging System: Even with a new battery, a faulty alternator won't recharge it, leaving you stranded again quickly. Have the charging system tested at an auto parts store.
5. Other Possibilities:
* Security System: Some vehicles have sophisticated security systems that can prevent starting if there's a problem.
* Neutral Safety Switch (Automatic Transmission): This switch prevents starting unless the transmission is in Park or Neutral. Make sure the gear selector is correctly in Park or Neutral.
* Fuel System: While less likely if the engine cranks, make sure the fuel pump is working and there's fuel in the tank.
What to Do Next:
If you're not comfortable tackling these checks yourself, take your Ford van to a mechanic or auto repair shop. They have the tools and expertise to diagnose the problem accurately. Attempting further troubleshooting without proper knowledge could potentially damage other components. Explain all the steps you've already taken.
