So long story short my windshield leaked on my 2000 psd 2x4 xlt Crew cab long bed auto truck. The underdash harness and fuse power distribution box corroded and malfunctioned. My dad gave me the truck. I pulled the dash and purchased a used harness and box on ebay. Everything looks good and matches up except one plug. It comes out of the green loom at the fire wall. On my stock harness it had a plug but on the replacement harness there is no provision for it. Can anyone tell me what this plug is and what it's function is? It's mid way under the dash almost center.
Help identifying plug on under dash wiring harness?
- Thread starter Joejohn
- Start date
fordf350man
Full Access Member
Cant find anything for sure, But I did read that Ford had wiring for brake controllers already built into the harness. Maybe that is what this connector is. 
trackspeeder
Stone crusher.
AIC plug.
Cant find anything for sure, But I did read that Ford had wiring for brake controllers already built into the harness. Maybe that is what this connector is.
No I actually have the trailer wiring hooked up just like my original harness. This looks like something safety related maybe.
What is an AIC plugs function? Is it nessicary?
trackspeeder
Stone crusher.
Aux Idle Control. It is used for PTO and charge protect functions. It can be found in ambulances and trucks that require PTO functions. It was an option on OBS and SD trucks.
The box plugs into your connector.
The box plugs into your connector.
There was not a box plugged into that connector, it has a harness that runs several different areas. It's loomed with the green loom which is normally for air bags. I don't think its the AIC.
perhaps its for your power windows and door locks
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