Today my batteries would not start the truck and the voltage was 12.4V. So I need to load test them. They are the original batteries and now are three years old.
I know that I have to disconnect at least one of them in order to test it. The question is do I have to disconnect them both in order to test both?
I know that I have to disconnect at least one of them in order to test it. The question is do I have to disconnect them both in order to test both?