Mysterious plug behind driver side headlight - Ford Powerstroke Diesel Forum
 
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post #1 of 2 Old 02-10-2013, 01:22 PM Thread Starter
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Mysterious plug behind driver side headlight

On my 2000 f350 I noticed right behind the driver side headlight is a plug that is not hooked up to anything just laying around back there. It has a yellow and orange wire coming out of it and they seem to be tied into the rest of the headlight harness. I put a circuit tester on the plug and it always has constant power comin to it even when the truck is off. I have no idea what it goes to. Any thoughts???
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post #2 of 2 Old 02-10-2013, 02:43 PM
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i believe its a plug for the hydraulic control unit (HCU) for the brake system. It does a self check after the key is turned on. Trucks' equipped with the device, it sounds like a growl winding down.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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