When I turn on my headlights they will stay on for a solid ten minutes and then out of nowhere will go on and off the rest of the way i tried checking the grounds but that doesn't help. When I hold my high beams on the highs stay on and you can see the regular lights flicker and the amber lights will stay on but everyone hates driving into high beams but that's better than no headlights at all. Like I've said I have checked all my headlight grounds do you think it could be my headlight pull switch on the dash board that just needs to be replaced?

 

Yeah, the headlight switch is a good bet...

 

Okay I'll pull the switch out of my other truck and see if that solves it. I'll let you know what happens

 

There should be a circuit breaker for the headlights, not a fuse. If the lights are pulling to much current the breaker will trip, but it is a thermal breaker so when it cools off it will make contact again until it heats back up. What doesn't make sense though is that the brights work. I believe the highs and lows use same breaker. At work don't have my wiring diagram with me.
Have you added additional lights that pull more load? You could have a short somewhere, but that would not normally be intermittent and would kill lights quicker.

 

Where would I find the circuit breaker, in the fuse box? And there's no additional light

 

I assume you are talking about a '94. Looking at the schematics. Looks like Ford used a fuseable link and not a circuit breaker. The power from the light switch goes to the "multi-function" switch (headlight/turn signal), then is switched for high or low beam. That being said, the problem has to be in the "multi-function switch or some where past it. If it was before switch it would affect both high and low. Problem probably in switch in column. Wire from Multi-function switch to high beams is Light green/black to wire to low beams is red/black. If you could find a spot to tap in and run direct to lights it would verify if it is switch or not. Use a fuse in case it is a problem with a short. Do you have day time running lights, if so some other things to check

 

My truck is older so can't compare. Used to have a '95 so going from old memory. I believe there is a connector under dash on top of steering column. You might be able to tap into wiring there for testing, but don't think you should drive with that disconnected you will have no brake/tail lights.

I don't think it is the case on the ford. But I have worked on vehicles that had multiple wires with the same color coding but different size for different purposes. Might check before hooking into one.

 

You need to put relays on the headlights to take the load off of the Headlight switch. Check this out, it will explain what you need to do: https://www.ford-trucks.com/forums/1...t-upgrade.html

 

Ill look into that when I get some time thanks for the info

 

i have the lmc light harness for my 86 and it makes the lights brighter and it takes the load off the switch as stated and for my 86 and for my 86 the harness is only $35+

 

bronco graveyard has the relay harness for a bit less than lmc truck.

 

I didn't pay for mine it was on one of my parts trucks

 

So I finally had some time today to pull apart my dash and this is what I found...

 

so that is why it is recommended to run the head light & running light relays.

i will be doing both of those relay mods.

 

Haha as will I. I'm also reading this article, looks easy enough. Whiter Whites, Brighter Brights .: Articles