Is it possible to wire a blower fan to keep it runs on ACC position key?
Reason being is I have Webasto heater installed to keep the engine running warm while parking in a sub zero winter, and I would like to have a blower run on ACC position when sitting in the truck without draining too much battery to FICM/other relays at On position key.

Thank you.

 

Sure it is! Work and effort involved! But I wired some light for work ta my truck like tht! And battery useage depends on size of fan motor naturally. You can buy or look on interenet for which wires run up steering column. I wud tell u but I forget!... Then its simply finding the right color coded wire and splicing in.