does charge fully, the charge should not drain if it is not in use. Troubleshoot continued problems by using a multimeter (service part number 19602) to see if your battery drains power while not in use. If it holds the charge through testing, you may have an issue with the alternator....
Step 3: Using a Digital Multimeter Moving onto a digital multimeter. Make sure the test probes are in the proper location, then is setting the multimeter to the two-digit DC voltage setting. A vehicle’s electrical system is DC, meaning direct current. Here I’m using the trailer harness ...