DIY - Saab Knowledge Base

Tip of the Day: Enhancing Grounding in Saab Diesel Vehicles for Improved Performance

Enhance Diesel Engine Starting: Adding Additional Grounding to Your Saab Battery

Check voltage: The residual voltage can easily be measured with a battery tester. If it is below 12.6 volts, it should be recharged as soon as possible.Check voltage: The residual voltage can easily be measured with a battery tester. If it is below 12.6 volts, it should be recharged as soon as possible.

Saab diesel vehicles require batteries with larger capacity and good grounding. Diesel engines typically require more electrical power to start and operate compared to gasoline engines, and Saab vehicles are no exception. Therefore, it is recommended to use batteries with higher capacity to ensure sufficient power supply.

Additionally, a well-maintained grounding system is important for diesel vehicles, including Saabs. Good grounding helps establish a reliable electrical connection between various components and the vehicle’s chassis. It aids in the proper functioning of electrical systems, reduces the risk of electrical issues, and ensures the efficient flow of current throughout the vehicle.

To maintain good grounding, it is advisable to regularly inspect the grounding points in the vehicle, including battery terminals, engine ground straps, and other relevant connections. Clean any corrosion or debris that may hinder the electrical contact and tighten the connections as needed. By prioritizing proper grounding and using batteries with adequate capacity, Saab diesel owners can help optimize the performance and reliability of their vehicles.

An extra earth connection in Saab?!

Adding an extra earth connection from the battery to improve starting is not a recommended solution. In modern automotive electrical systems, the earth (or ground) connections are designed to provide a reliable path for electrical current to return to the battery.

The primary purpose of the earth connections is to ensure proper operation of electrical components and to prevent unwanted electrical interference.


If you’re experiencing difficulties with starting your vehicle, there are several more effective and appropriate steps you can take:

  1. Check the battery: Ensure that your battery is in good condition and holding a sufficient charge. If the battery is old or weak, it may not provide enough power to start the engine. Consider having the battery tested or replaced if necessary.
  2. Inspect battery terminals and connections: Ensure that the battery terminals are clean, tight, and free of corrosion. Corrosion can impede the flow of electrical current, affecting the starting performance. Clean the terminals with a battery terminal cleaner or a solution of baking soda and water, and tighten them securely.
  3. Examine the starter motor: A faulty starter motor can cause starting problems. If you hear a clicking sound when you turn the key, it may indicate a problem with the starter. Have the starter motor checked by a professional mechanic to determine if it needs repair or replacement.
  4. Check the ignition system: Faulty ignition components, such as spark plugs or ignition coils, can affect the starting performance. Have the ignition system inspected and serviced if necessary.
  5. Consult a professional: If you’ve gone through these steps and still experience starting issues, it’s best to consult a qualified mechanic who can diagnose the problem accurately and provide the appropriate solution.

Remember, modifying the electrical system of your vehicle without proper knowledge and expertise can lead to electrical issues or even damage to the vehicle. It’s always best to consult with a professional mechanic or automotive electrician for any modifications or repairs.

Still, Adding an extra earth connection

To add additional grounding to the battery in a Saab for improved diesel engine starting, you can follow these steps:

  1. Locate a suitable grounding point: Identify a sturdy and clean metal surface near the battery or engine compartment. Look for existing grounding points or metal brackets that can serve as a connection point.
  2. Prepare the grounding cable: Obtain an appropriately sized grounding cable, preferably one with a thick gauge to handle the electrical load. Cut the cable to the required length, ensuring it can reach from the battery’s negative terminal to the chosen grounding point.
  3. Disconnect the negative terminal: Prior to installation, disconnect the negative terminal of the battery to prevent any accidental electrical contact.
  4. Clean the contact points: Thoroughly clean the contact area on the battery’s negative terminal and the chosen grounding point. Remove any corrosion, rust, or dirt using a wire brush or appropriate cleaning solution. This will help establish a solid electrical connection.
  5. Attach the grounding cable: Securely connect one end of the grounding cable to the battery’s negative terminal. Ensure it is tightly fastened and that there is good metal-to-metal contact.
  6. Attach the other end of the cable: Attach the opposite end of the grounding cable to the chosen grounding point. Use a bolt, nut, or appropriate fastener to secure the connection tightly.
  7. Test and reassemble: Double-check that all connections are tight and secure. Reconnect the negative terminal of the battery. Start the diesel engine to confirm if the additional grounding has improved the starting performance.

By adding additional grounding to the battery in your Saab diesel vehicle, you can enhance the electrical flow and provide a more robust starting system. Remember to prioritize safety and ensure all connections are properly secured. If you’re uncertain about any step, it’s always recommended to consult a professional or an experienced automotive technician for assistance.

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