Can DPO3 be used as a fan relay control on a Elite750? I just read some scary stuff about DPOs " Only DPO outputs 17 and 18.." on a solid state relay diagram from a two harness unit
To make maters more confusing, I was planning on running the fan directly from a fuse block using a solid state relay with the load positive and using the haltech 12v wire and the DPO3 to trigger to ground on the input side. Then I read the image below. My concern is I do not have a switched 12v that is dedicated that can take the load of the fan. Could I run the load off of the fuse block and if I do and wire things up according to the diagram, would the higher amperage load cause issues with DPO? Or is this what the resistor protects. I am expecting variable speed control when this is done . I don't know how things that seem simple get so overwhelming. If I have to have 12v switched could I use one electromagnetic relay to energize the dedicated line from the fuse block and use the digital relay to control the fan from the 750?

 

I have been pointed into the direction of a mercedes PWM controller .