Intake Heater operation

[1974ford_cummins]

My wait to start light is not functioning, I checked the relays they can be powered up (using engines remote start switch) and fire up the heater grids. Does any one know of any wire colors and functions for the controler, or a website link to schematic's??? Thanks

[Mopar1973Man]

Well as far as I understand the grid heaters are controlled by the PCM under the hood near the battery. The IAT sensor sense the intake temps and desides if the grid heaters are needed. Now I know th key trick works on the 1st gens and will display a flash code on the CHECK ENGINE light. I'll get ahold of Taz and find out what wires are hooked to the relays...

[1974ford_cummins]

How does they key trick work, I don't know mutch about dodge's. I still have the engine in the dodge it hasn't made it into the ford yet, The heater circuit is my last hold up I believe!! I would like to get it running 100% and totaly figured out electricaly in the dodge B4 I install it into my old ford. Any help is appriciated thanks!!!

[Mopar1973Man]

Here is the wiring diagram of the 1st Gen Dodge... http://mopar.mopar1973man.com/cummins/1stgen/wiring/wiring.htm Then here is the ket trick for reading error codes... http://forum.mopar1973man.com/showthread.php?t=914 Basically you want to turn the ignition on, off, on, off, on in under 5 seconds and the CHECK ENGINE light will come on and start flashing codes...

[1974ford_cummins]

thanks for the advice!!!