Mystery wiring harness behind grill? - Ford Powerstroke Diesel Forum
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Old 11-15-2012, 05:03 AM
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Mystery wiring harness behind grill?

When changing out my headlights I came accross this....



Can anyone tell me what this is? Is this the wiring harness to my block heater? It is located behind the front clip on the driver side near the headlight openings.
It is packed full of dirt and didnít want to mess with it until I knew what it was? Or even know if I should mess with it.
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Old 11-15-2012, 05:44 AM
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Is that the daytime running light module connector?
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Old 11-15-2012, 08:22 AM
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Def. nothing to do with the block heater, since it's not part of the truck's electrical system. Can you provide a wider shot, to better show where it's located?

But my first guess would be ^^^^^ DRL, which would be N/A if the truck wasn't built for Canada.
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Old 11-15-2012, 08:38 AM
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I have a Canadian truck (the cluster is in metric) and I have DRL......
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Old 11-15-2012, 08:47 AM
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I haven't poked around very much under the bumper/headlight area. Would our chassis wiring harnesses have a pigtail for fog lights like the optional ones on the f150
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Old 11-15-2012, 09:09 AM
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I would love to take a new pic but I have already put my front clip back on.

So if you take your grille off and then you bezels like you are going to swap out you headlights. Next you have to remove the front clip that hold you headlights on, once that is removed you have your radiator in the center then then on the metal there are holes cut out for you headlights... this was clipped right next to the drivers side headlight opening on the metal.
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Old 11-15-2012, 09:20 AM
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Its for the DRL module. If you unplug the cap, your Bright headlights will not operate, nor will the park brake light illuminate on the dash.

It shorts a couple of wires together, to allow the brights to work. Its designed so that when you plug in a DRL module, the brights run at 80% for Daytime running, but they shut off when you engage the park brake
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Old 11-15-2012, 09:25 AM
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Hmmm.... Interesting.
So basically Im not doing anything bad by not pugging it in? I still have headlights high/low, parking/bumper, and signal lights so I should be good.

So I guess my truck does not have block heater hu?
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Old 11-15-2012, 09:29 AM
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Its already plugged in. US market has a plug, Canada market has a module that removes the cap, and plugs in the module.

Just dont remove the cap, and all is good.
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Old 11-15-2012, 09:33 AM
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Sounds good. I didn't mess with it, my luck I would have cleaned the dirt off of it and caught the hot side of the connection and got shot across the garage into the Jag.
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