how do u check to see if u have loose wire connection for headlights

Asked by Apr 05, 2013 at 09:54 AM about the 2010 Ford F-150 XLT SuperCab

Question type: Maintenance & Repair

they work sometimes, then they wont work for hrs

19 Answers

You have a headlight relay....this one is on the fritz-

1 of 1 people found this helpful.

and a circuit breaker, when it cools it will re set it's self, but the problem is probably a short, need to start tracing wires if the Judge's suggestion does not do the trick, but that first, the relay as he states

and a circuit breaker, when it cools it will re set it's self, but the problem is probably a short, need to start tracing wires if the Judge's suggestion does not do the trick, but that first, the relay as he states ..but your real question...look at all the wires and looms, feel them, for frayed insulation, gently pull on them to see if it comes un attached ...from the lights to the part as far as you can see them, where they pass through the firewall...from the light fixture they will collect in to a loom with many other wires and go to the underhood fuse/relay power distribution box

1 of 1 people found this helpful.

click on that image up there it's very good

3 of 3 people found this helpful.

really not to sure, was looking for a location on the relay and spotted this 'enhancement' to the wiring, and thought why would something as basic as headlights enhanced, and fatheadrock's problem is probably the reason. A circuit breaker doesn't usually reset itself, does it? just wanted a relay diagram and appear to have caught my foot in a bear trap~

2 of 2 people found this helpful.

so according to this diagram there are two relays, and a FUSE shown, but a thousand words is needed here instead of a picture~

1 of 1 people found this helpful.

lotsa diagrams out there...muy confuziado~

2 of 2 people found this helpful.

one more to delight the broth-

2 of 2 people found this helpful.

actually on many cars. my Ford truck I know for sure, it will re set it self when it cools. But the truck in question here is 32 years newer than mine. and the pickin's ain't slim on your images

Don't you just LOVE that one. had to share it. wish I had a guide at hand to de-code these descriptors, but only a couple of strangies out there- Seems so basic...a switch, power to it, gazinta and comezata, but there's a world of better ideas comin' from ford~

1 of 1 people found this helpful.

ink on vellum, no room for mistakes, been there done that.

But you know that really is a very very good cut~away of the innards of the dash, it's real clear if you click on it

vellum as in animal hide? not canvas or paper?

99,185

"how do u check to see if u have loose wire connection for headlights" -- if the connection is loose, it will be warm. Headlights could be dim because a lower voltage or a poor ground connection .

99,185

"they work sometimes, then they wont work for hrs" -- that's a whole different issue. A loose connection will not keep them off for hours. A overheated resettable circuit breaker would stay off for less than a minute. This truck may have a Body Control Module (BCM) that controls the headlights and that might be the cause of the problem.

2 of 2 people found this helpful.

TS I've been hailing this guy to come back, and ask him that..why...if they are dim or flicker or what, even a PM no response. But good point they would be ...didn't think of that

Yep as a matter of fact it does, I could follow a 'hot at all times' to a fuse to main light switch , daytime running lights, fog lights from that schematic ..there is a lot of discussion on ford forums about the BCM and installing remote start and headlights

99,185

That's correct, David. As these cars become more complex with automatic light functions and half voltage applied for daytime running lights, the resulting problems become more complex too. -- If the schematic is correct, it shows a "Autolamp module" on the left side. That sends a ground potential to the relays so they fire the headlights and running light relays when the Main Light Switch is in the Auto position. If that main light switch is in the "Head" position, the lights should be on. -- That is assuming that the schematic is the correct one for the 2010 Ford F 150.

1 of 1 people found this helpful.

ouch~

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