I own a 2012 E350 cutaway with a Reading CSV body. I recently installed a 750 watt power inverter and would like to hook up the SEIC function when I use the inverter.

I have a 5k pot hooked up to the green wire and the pot is being fed by a switched 12 v wire that also is hooked to the yellow/green wire. When I flip the switch the engine idles up to 900 RPM but the pot does not raise or lower the RPM's. When I put a multimeter on the green wire turning the pot does change the resistance (from 0 to 5000 ohm) and voltage (from 14 V to 0 V) of the green wire but the idle stays at 900 until I turn the switch off. I also tried hooking the blue/green wire with the yellow/green wire and that also did not affect the RPM's over 900.

What am I missing?

I got this info from the Ford Body Builder Layout Book SEIC/PTO Wiring for 2012.

 

The engine will ignore changing resistance on the SEIC wire. Only diesels can be variable like that. Put a 1k resistor in and see if it jumps up. You also need to put 12v+ to PTORS2 (Blue/green) to tell SEIC that the PTO is engaged and ready to climb in RPM, but your truck may not be so equipped.

That said, on a good day a real 750 watt inverter will only pull about 60 amps, and thats at maximum.

 

12v+ to PTOS1 (yellow/green) and 12v+ to PTOSR2 (blue/green). Then put a 1k resistor between 12v+ and PTOIR (green). All the 12 v+ can be combined on a swich to enable and disable SEIC. Do I have it correct?

I know that the 750w inverter is not that big but I would like to get a larger one later on. I'm also looking for the wow factor of the guys at work when I flip a switch and idle up the truck.

 

That should do the trick. If not lemme know and i can get off my *** and pull it from the service manual.

Edit to Add: Make sure you are in park, touch the service brake at least once after starting the engine, and you have the parking brake engaged.

 

It works perfectly. I never touched the service brake before and that lead to the problem I was having. Thanks for your help.