Can anyone tell me where the items I should test are and how to go about it. I have about a 500 milliamp draw which I isolated with a multimeter to fuse #7 yesterday. The battery has been drawing down and not starting my diesel for a while now, but since it was recently tested as OK, I did the definitive test. Not I am at a bit of a loss as to how to proceed. I guess I could take it to Blazer.