Here's how:
1. Safety First: Disconnect any metal jewelry and ensure the vehicle is OFF and the ignition is in the "OFF" position. Wear safety glasses. Have baking soda and water nearby in case of acid spills.
2. Identify the Battery Terminals: The battery will have two terminals: a positive (+) terminal (usually marked with a "+" sign or red) and a negative (-) terminal (usually marked with a "-" sign or black).
3. Locate the Battery Cables: You'll see two heavy-gauge cables connected to the battery. One is the positive cable (often red) and the other is the negative cable (often black). These might be clamped directly to the terminals or have bolted connections. If they are bolted, use the correct size wrench to loosen the bolts.
4. Disconnect the Old Battery (if replacing): If you're replacing the battery, first disconnect the negative (-) cable. Then disconnect the positive (+) cable. This prevents sparks and short circuits.
5. Connect the New Battery (if replacing):
* Positive (+) First: Connect the positive (+) cable to the positive (+) terminal of the new battery. Make sure the connection is secure and tight.
* Negative (-) Second: Connect the negative (-) cable to the negative (-) terminal of the new battery. Again, ensure a secure and tight connection.
6. Reconnect the Old Cables (if not replacing): If you just needed to disconnect the battery for maintenance, simply reconnect the cables in the reverse order of disconnection—positive (+) first, then negative (-).
7. Double-Check: After making all connections, visually inspect to make sure everything is secure. Loose connections can cause problems.
8. Start the Vehicle: Try starting the vehicle. If it doesn't start, double-check your connections and make sure the battery is properly charged.
Important Considerations:
* Battery Type: Make sure the replacement battery (if any) is the correct type and size for your 1990 Ford F-150. Consult your owner's manual or a parts store for the correct specifications.
* Corrosion: Clean any corrosion from the battery terminals and cable ends using a wire brush or terminal cleaner before connecting the cables. A paste of baking soda and water can neutralize acid spills.
* Acid Spills: If acid spills on your skin or clothing, immediately flush the area with plenty of water for at least 15 minutes and seek medical attention.
If you're uncomfortable performing this task yourself, it's best to take your vehicle to a qualified mechanic or auto parts store for assistance. They can do it safely and quickly.
