As the title says, I need help with an issue I am having with my high beams.

First off, its a 2007 FX4 truck with retrofitted (stock housing) lights.

A year or so ago, maybe more (I don't feel like digging at the moment for a date), I had a member on here retrofit my headlights and they turned out great (trs - fxr system). I have had no problems with them until last week.

When I pushed the "lever" forward for the high beams to engage, the headlights shut off. If I pull the lever back for the flash to pass, the highs engage just fine and then just the lows stay on once the lever is released.

Also, when I had the fog lights on, the high beams would stay on when the lever was pulled back for flash to pass and then released (even this past week when pushing the lever forward to engage highs would turn the lights off).

I thought I read in other posts to replace the high beam fuse, but when I checked this fuse, all was fine. While doing that, I decided to do the "bambi mod" so my fogs could stay on with the highs (when everything is working properly).


So, does anyone have any ideas as to why my high beams quit working all of a sudden and how I can resolve this issue?


I am trying to clarify the symptoms as well as I can, but if there are any other things I should check to help diagnose the problem please let me know!

Thanks everyone in advance for your help, I will stop by periodically to check and update!

 

Double check the fuse (#35/20A) and might as well check the wiring harness too. Does the high beam indicator come on when trying to turn turn them on?

 

Yesterday evening I checked fuse 35 and ended up swapping it with a different fuse, even though it was fine. I have not checked the high beam indicator being on or not when I try to engage them.

 

Never mind skimmed the post and missed it. Sorry OP

 

I'd say possibly the H13 relay is bad or going bad.. Maybe contact TRS they could help you trouble shoot that.

 

There is a possibility that it can be your Multi-Function switch.
Notice how the lows AND the highs work in any position ( e.g. flash-to-pass ), EXCEPT in the "forward" highbeam "On" position.

This suggests to me that both the relays AND the fuses are fine - as is the harness itself, since it's the same circuit path. Only the MFS position is different.

Here is a link to help you trouble shoot your Multi-function switch. https://www.f150online.com/forums/5019565-post7.html

Trouble shoot it and see what you get and report back here. Thank you.

 

Thanks for the help thus far. After looking last night, and before I saw the rest of the replies, here is what I have found thus far.

When I throw the MFS forward to engage highs (the lights still go out obviously) the high beam dash indicator lights up as if it thinks the beams are on.

When I pull the MFS back to engage flash to pass, its like the highs and lows work together.

Also, when trying to engage the highs, there is a very loud/audible click sound coming from up by the relays (I didn't have another person around to help me pinpoint the sound though).

So I am leaning towards the relays going or shot, as was suggested.

I will be contacting TRS to see if they can help or if I need to replace the relays.

Thanks again thus far and I will update when I can check it out or here back from TRS.

If anyone else has any other ideas or spots to check, keep firing away!

 

Luke, Fabian here.
I called up a friend that I did a retrofit for at the same time I was doing yours so I could look at his harness and relays as his were identical to yours. My setup is about three years older than yalls and my wiring and relays were significantly different.
He was kind enough to let me get the truck and check it out.

From what I gather thru this post and your email, your MFS should be fine.
When you throw it in high, the loud clicking you hear is the projectors pulling the shroud down and enabling the high beam.
That alone tells me that the truck portion of the wiring is ok since the projectors are receiving signal to switch to high.
I think your hid harness may have a relay that's out or a faulty connection at the headlight. I just checked my friends truck and when it kicks to high beam the left side relay activates and illuminates a small green LED. Since you have to diagnose it alone you will probably not be able to hear the click of the relay but I double checked and if your looking at the two relays with the mounting tab away from you, the left one is the high beam side. you should kick it in to high beam and come back and look at it. The little green led will be illuminated thru the clear casing if its active.
Give it a shot and let me know what you find out either here or via email.

 

You need to read this.
http://www.theretrofitsource.com/pdf...%20Harness.pdf

I believe the loud clicking is actually the moto control relay working or trying to work. The solenoid shield doesn't make that much noise.. I still believe the MFS is still bad. Test it by installing your factory halogen into your factory H13 plug and see if the bulb goes into high beam.

 

Lariat, his harness is from before the morimoto control box, his still has two relays controlling the hids. And his halogens work as they should when plugged in so the switch is probably not at fault.

Also the clicking on the solenoid on his version of the projectors is quite audible, more so than your regular 40amp relay.

I've retrofitted and installed about three different versions of the FXR kits and they have gotten way quieter since my original FXr projectors. Trs has improved just about everything on them including the relays to that new morimoto box.
His are just a little older, and mine are ancient lol I still have diodes on my harness

 

Oh, didn't know it was before the morimito control box.
When did we find out the halogens still worked?

 

I was emailing Fabian on the side at the same time as this thread, as he did the retro for me. So I told him the halogens worked but forgot to post that back here, my apologies.

I still haven't gotten a chance to check the indicator lights on the relays yet, but hope to do so soon so I can get this taken care of.

Thank you both for all the help and new knowledge. I have an email in to TRS to see if I need a new relay and be done or if I need anything else for the fix too.

I will update again when I hear back, thanks again for everything!