I have an 04 that the intake heater has worked in a couple years . I looked at the wiring an the engine is in an IC FE 300 so it's kind of hard to see . So we bought a intake heater off on International that is whole replacement and does away with all the wiring . The part we got is 1858202C91 the the intake has an ear where the relays ist and there is a male plug with two purple wires . I know the cable to power the heater goes to the positive terminal of the starter . Where do I plug the connector to turn on the relays ? They are purple color coded Hope someone can help because I am not even sure what sensor turns on the relays . If you type that number into EBay you can see what I mean .