Small Green Electrical Connector on Rear Diff. What is it for?

[Baywolf]

2021 F-150 Sport with Electronic locking diff.

I noticed a small green male electrical connector near my rear diff that was not connected and was just dangling. I found a female connection attached to the top of my rear diff that the plug fit perfect, so I plugged it back in.

What is that connector for? I suspect I've been driving for some time with it disconnected. I don't go off road, so have only put the vehicle in FWD on very limited occasion and didn't notice any ill effects that I was aware of.

I am taking the truck into the dealer to have them check out a loud "clunking" sound I occasionally get that sounds like it's coming from my drive shaft.

Thanks.

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[Kanuck]

I would think it is th connection for the diff lock..

 

[SumGuy]

The usual abbreviation is 4WD. FWD is typically used to reference front wheel drive.

I would guess that sensor is either the diff lock or a temp sensor.

 

[Eighthtry]

Dam. A mystery in the making.

 

[hotrodmex]

You plugged the connector into the holder meant for non-locking trucks. The plug should go to the diff lock connector here:

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