Andrew I think that is it as there was a specific ohm and watt resistor that they wanted you to get but when I got to radio shack (several years ago) I had forgot what those (2) values were so I got both (1 ohm 10 watt & 10 ohm and 1 watt iirc) then I lost the note on it but iirc you could do that parallel check with eng running to check the draw (amps) being used. does that sound right. I have both resistors still so I am gonna try it with the right one you mentioned. I'm thinking it was a way to check running draw amps without pulling a batt cable & needing a high dollar meter in series with that cable/post that could handle & directly read amps