Easy way to check draw.Close doors make sure nothing is on.Disconnect neg cable.Attach test light to neg cable couch other end to neg terminal.Should be no light or super dim as computer,memory etc darw a bit.
Just for giggles, I went to the garage and checked my car. I put a test light on the negative terminal and negative cable while attached and no light. Tested with the battery cable off and same. I did get light from positive to negative with it connected. Voltage sitting is 12.55. Are you sure this method works?
