What is this Plug?

[mjonesjr]

I was re-routing the block heater cord the other day when I noticed this plug under the hood, right behind the driver side headlight.

Anyone got any ideas what it is for?

[OverkillMotorsports]

I asked the same question and never found out!

What is this plug for

[ridiculously_necessary]

optional fog lights maybe? is it just on one side? where does the harness go?

[mjonesjr]

Yes it is on one side only. The wiring for it goes Into the main harness that runs across the top of the header panel.

[dazdillenger]

Do your trucks have ABS? Because to me it sure looks like an ABS plug.

[OverkillMotorsports]

ABS was only offered on the rear of the trucks and the harness attaches to the core support right behind the driver headlight.

I tested it with the ignition on and nothing was hot, but I did not test it with the headlight switch turned on. Seems all the trucks I have thought to check for it have it though. Originally I was thinking it may be for a PTO device or a temp sensor for a rear view mirror that displays temp possibly.

[superduty4x4]

I was wondering the same thing recently, I'm wondering if the harness is a universal type and that plug has a function on a different rig, say F150 or Bronco.

[351fifty]

my f-150 doesnt have one like that at all up front, its a 95, im gonna check my truck now and see if its there too

[pjwoolw]

I believe its for the daytime running lamps. Feeds the module. The sold in Canada rigs had to have them.

[351fifty]

could we install them on our US rigs?