DIY: How to Test a Vehicle's Battery
Difficulty Level
Tools/Supplies Needed:
• 12V battery load tester• socket set
• ratchet set
Procedure:
• make sure the needle on the gauge reads 0• adjust accordingly if needed
• adjustment procedures will vary between models of load testers
• ensure that the battery is or exceeds 12.4V (fully charged battery is over 12.6V)
• remove the battery from the vehicle
• determine what the cold cranking amperage is of your vehicle's battery
• ensure that the posts are clean before testing
• put the battery tester clamps on the battery posts and ensure they are secure
• push the test switch, not holding it longer than 10 seconds
• when the needle stops moving, take the reading
• if the battery reading is under 9.6V, it needs to be replaced
• depending on your vehicle's cold cranking amperage will depend where it falls on the graph of the load tester
• so this will determine what the appropriate specs are for a good battery
Video tutorial on how to determine if the battery in your vehicle is still good by doing a load test. In order to do a load test, you will need to purchase a 12V load tester which can be found at your local auto or tool supply store. The one that is used in the video was purchase at Princess Auto on sale for $25. The original price was $50. I do recommend doing a battery load test yourself, because I have found in the past that some auto parts stores and automotive repair shops do have faulty equipment. Therefore you will be spending extra on purchasing a battery you don't need. This particular tutorial was done on a 1997 BMW 540i.