The red wire on the NEW derale diagram is the ground path, which is counter intuitive, but a ground path nonetheless. Using the first diagram for the GM part of the circuit, eliminate the OLD derale part of the diagram and using the red(counterintuitive) wire from the derale relay of the new diagram, splice it to the ground side of the cooling fan relay coil.Like I said which ever one grounds the circuit , runs the fan. Leaving the factory harness totally intact.
Fact is stranger than Fiction
Last edited by LATECH; 06-28-2012 at 08:08 PM.