Car wiring diagrams: Fahrenheat Fuh5 4 Wiring Diagram, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. I have my Fahrenheat FUH wired up according to the following posts Can you show of pic of the unit s actual wiring diagram as they will be .Calling the electricians! Marley Fahrenheat FUH heater wiring Lighting Electrical. I posted the wiring diagram too. SuperOldSchool..Preparing the Wiring. After a little research, I chose a new Fahrenheat FUH garage heater. At watts, it is still undersized for my x garage, but it will .