Range Rover won’t start after an alternator replacement

If your Range Rover won’t start after an alternator replacement the likely causes are faulty battery connection, defective alternator, damaged wiring or fuses, battery drain, or faulty starter motor.

Read on as I guide you through the signs and symptoms, possible OBD codes, and common causes, and even provide you with tips on how to fix it.

What models are affected?

Signs and symptoms

Before we can tackle the issue at hand, it’s crucial to understand the signs and symptoms that often accompany a Range Rover that won’t start after an alternator replacement.

These may include:

  • The engine cranks but doesn’t start
  • The vehicle remains completely silent when attempting to start
  • The engine starts intermittently or stalls shortly after starting
  • Various warning lights illuminate the dashboard
  • The battery loses power rapidly

If you’ve experienced any of these symptoms, you’re not alone. It’s time to dig deeper and identify the potential causes.

List of possible OBD codes

When dealing with a Range Rover that won’t start after an alternator replacement, several OBD codes may shed light on the underlying issues.

Here are a few relevant codes to watch out for:

  • P0620: Generator Control Circuit Malfunction
  • P0562: System Voltage Low
  • P2509: ECM/PCM Power Input Signal Intermittent

Understanding these codes can help you pinpoint the root cause of your starting woes.

Common causes

Now, let’s explore the common causes behind the Range Rover’s stubborn refusal to start after an alternator replacement.

Here are a few common causes:

  • Faulty Battery Connection: Ensure that all battery connections are secure and free of corrosion, as a loose or corroded connection can disrupt the power flow.
  • Defective Alternator: It’s possible that the newly replaced alternator may be faulty, failing to provide the necessary charge to start the engine.
  • Damaged Wiring or Fuses: Check for any damaged or loose wiring connections and blown fuses, as these can impede the electrical current from reaching essential components.
  • Battery Drain: If the battery was excessively drained before the alternator replacement, it may take some time to recharge fully, resulting in starting difficulties.
  • Faulty Starter Motor: It’s worth considering that the issue may lie with the starter motor itself, rather than the alternator. A faulty or worn-out starter motor can prevent the engine from turning over.

Can it be fixed without a mechanic?

It entirely depends on the cause, you may be able to get your Range Rover up and running without the need for a costly trip to the mechanic.

However, always prioritize safety, and if you’re unsure or uncomfortable with the troubleshooting steps, it’s best to seek professional assistance.

Parts you’ll need to fix it

To tackle these common causes, you may need the following parts:

  • Replacement battery (if necessary)
  • Replacement alternator (if found to be defective)
  • Electrical connectors and wires (if damaged)

Tools you’ll need to fix it

In your quest to resurrect your Range Rover, having the right tools at your disposal is crucial. Here are the key tools you’ll need:

  • Socket wrench set
  • Multimeter
  • Battery charger or jumper cables
  • Wire stripping and crimping tool
  • Electrical tape

How to fix it

Now that we’ve covered the essentials, let’s dive into the step-by-step guide to fix your Range Rover that won’t start after an alternator replacement:

  1. Perform a Battery Check: Use a multimeter to check the battery voltage and ensure it is within the manufacturer’s specifications. Charge or replace the battery if necessary.
  2. Inspect Battery Connections: Examine the battery terminals and cables for any signs of corrosion or looseness. Clean and tighten them securely.
  3. Check Alternator Output: Connect the multimeter to the battery terminals while the engine is running. Ensure that the alternator is charging the battery within the recommended voltage range. Replace the alternator if it’s found to be defective.
  4. Inspect Wiring and Fuses: Carefully inspect all wiring connections and fuses related to the alternator and battery. Repair or replace any damaged components.
  5. Evaluate the Starter Motor: If all electrical connections are secure and the battery and alternator are in good condition, consider checking the starter motor for any faults. Seek professional guidance if needed.

Potential alternative causes

While we’ve covered the most common causes, it’s essential to acknowledge that every Range Rover is unique, and there may be additional factors contributing to the starting issue.

These alternative causes may include:

If you’ve exhausted the steps mentioned above, it might be best to consult a trusted mechanic to identify and resolve these alternative causes.


Can a bad alternator cause the Range Rover not to start?

How do I test if my alternator is working correctly?

Should I replace the battery along with the alternator?

What are the signs of a faulty starter motor?


A Range Rover that refuses to start after an alternator replacement can be a frustrating experience.

By understanding the signs, checking for relevant OBD codes, and addressing common causes such as battery connection issues, faulty alternators, damaged wiring, and battery drain, you stand a good chance of getting your vehicle back on the road.

Armed with the right tools, a patient mindset, and the willingness to troubleshoot, you can overcome this roadblock and enjoy the open road once again.

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