1
- Open and secure the hood of your car.
- Locate the car battery.
2020 EcoBoost Ford Mustang Car Battery Replacement
The battery in a 2020 EcoBoost Ford Mustang provides the power needed to start the engine and run essential electrical systems, including the lights, dashboard electronics, and accessories. Over time, car batteries wear down and may no longer hold a reliable charge, leading to slow engine cranking, dim lights, warning messages, or a vehicle that will not start at all. Replacing the battery is an important maintenance task that helps keep your Mustang dependable and prevents unexpected breakdowns.
Before beginning this repair, make sure the vehicle is parked on a flat surface, the engine is turned off, and the keys are removed from the car. Because you will be working around the electrical system, use caution when disconnecting and reconnecting the battery terminals. Always disconnect the negative terminal first to reduce the risk of sparks or accidental short circuits. You should also be careful when lifting the battery, since it is heavier than it looks and can cause injury if handled improperly. This guide will show you how to safely remove the old battery and install a new one in your 2020 EcoBoost Ford Mustang using basic hand tools. This repair is a practical way to save money, build confidence in routine vehicle maintenance, and keep your car running reliably.
Step-by-step instructions
2
- Disconnect the negative (-) battery cable first with an 8mm socket.
- Loosen the nut on the negative terminal clamp.
- Gently wiggle the clamp and lift it straight off the battery post.
- After removing it, move the cable safely to the side so it does not accidentally touch the terminal again while you are working.
3
- Disconnect the positive (+) battery cable next with an 8mm socket.
- Loosen the nut on the negative terminal clamp.
- Gently wiggle the clamp and lift it straight off the battery post.
- Loosen the nut and move the cable to the side.
4
- Use a 10mm socket and ratchet to loosen and remove the bolt securing the battery hold-down clamp at the base of the battery.
- Lift the clamp out carefully and set it aside.
5
- Remove the old battery and install the new one.
6
- Place the battery hold-down clamp back into its original position at the base of the battery so it lines up with the mounting hole.
- Insert the bolt through the clamp, then use a 10mm socket to tighten it until the battery is firmly held in place.
- Make sure the battery does not shift or move, but avoid over-tightening the bolt.
7
- Reconnect the positive (+) cable first.
- Make sure the clamp sits fully and evenly on the post, then use the 8mm socket and wrench to tighten the terminal nut until the connection is secure.
- Reconnecting the positive cable properly helps restore power to the vehicle and prepares the battery for the final connection of the negative cable.
8
- Reconnect the negative (-) cable last with an 8mm socket.
- Place the negative terminal clamp over the negative battery post and tighten the nut with your socket and wrench.
- Reconnecting the negative cable last helps safely restore power to the vehicle and reduces the risk of accidental sparks during installation.
9
- Start the car and check that the engine cranks normally without hesitation or clicking.
- Look at the dashboard to make sure the instrument panel powers on correctly and watch for any warning lights that stay on longer than normal.
- If everything checks out, then the battery has been correctly installed.
Conclusion
To reassemble your device, follow these instructions in reverse order.
1. Install the new battery.
2. Reinstall the hold-down clamp.
3. Reconnect the positive (+) cable first.
4. Reconnect the negative (-) cable last.
5. Start the car and check for warnings.
Guide content belongs to iFixit, license CC BY-NC-SA. Open original