As if you need any more input ... how old is the car's battery, and are the cells all full? A healthy battery has very low internal resistance, and the voltage measured across it should not vary much if at all.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .