how to check if my Ford Explorer's alternator is bad

Ford Explorer Sixth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

527 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to check if your Ford Explorer's alternator is bad. Follow our step-by-step guide for diagnosis and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before working on electrical components.
•Allow the engine to cool before touching any components to avoid burns.

Symptoms

•Dim or flickering dashboard lights
•Difficulty starting the engine
•Frequent dead battery issues
•Electrical accessories malfunctioning or not working
•Overcharging or undercharging battery warning light illuminated
•Unusual noises such as grinding or whining from the engine compartment

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any related fault codes.
2
Measure battery voltage with a multimeter; a healthy battery should read between 12.4 to 12.7 volts when the engine is off.
3
Start the engine and measure the battery voltage again; it should read between 13.7 to 14.7 volts if the alternator is functioning properly.
4
Inspect the alternator belt visually for wear, cracks, or looseness.
5
Check the alternator connections for corrosion or loose wiring.
6
Listen for abnormal noises from the alternator while the engine is running.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Socket set
•Torque wrench
•Screwdrivers

Parts Required

•Alternator (if faulty)
•Alternator belt (if worn)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any related fault codes.
2
Measure battery voltage with a multimeter; a healthy battery should read between 12.4 to 12.7 volts when the engine is off.
3
Start the engine and measure the battery voltage again; it should read between 13.7 to 14.7 volts if the alternator is functioning properly.
4
Inspect the alternator belt visually for wear, cracks, or looseness.
5
Check the alternator connections for corrosion or loose wiring.
6
Listen for abnormal noises from the alternator while the engine is running.

Solution

1. Preparation

Tools Required:
- OBD-II scanner
- Multimeter
- Socket set
- Torque wrench
- Screwdrivers
Disconnect the negative battery terminal to prevent any electrical shorts while working.

2. Inspect and Test the Alternator

Sub-step 1: Remove the alternator belt by loosening the tensioner pulley using a socket set. Make sure to note how it is routed for reinstallation.
Sub-step 2: Remove the electrical connectors from the alternator by pressing the release tab and pulling them off gently.
Sub-step 3: Unscrew the alternator mounting bolts using the socket set. Keep track of the bolts for reinstallation.
Sub-step 4: Carefully remove the alternator from its bracket.
Sub-step 5: Use the multimeter to test the alternator output directly by connecting the leads to the alternator terminals. It should produce a voltage between 13.7 to 14.7 volts.
Sub-step 6: If the alternator is faulty, replace it with a new unit. Ensure to torque the mounting bolts to the manufacturer's specifications (usually around 30-40 ft-lbs) upon reinstallation.

3. Reinstallation

Sub-step 1: Reinstall the alternator in the reverse order of removal.
Sub-step 2: Reconnect the electrical connectors securely.
Sub-step 3: Reinstall the alternator belt, ensuring it is properly routed and tensioned.
Sub-step 4: Reconnect the negative battery terminal.