headlight issue

[iasc399ia]

I was driving home tonight and my headlights started flickering on and off by themselves. It also did it with brights on. The interior lights stayed lite and didn't flicker and the battery gauge stayed in the green and didn't move. These are brand new headlights not even 2 weeks old. I stopped and checked to make sure the plugs on the back of the headlights were secure and they were and I also checked to make sure my blackout light switch wasn't loose, which it wasn't. It drove fine with no other issues to report.
Anyone have any ideas?
Thanks ahead of time!

 

[iasc399ia]

Vehicle has never done this before

 

[iasc399ia]

I also tracked the wiring from the headlights and there was no short or grounding issue I could find once I got home.

 

[Warthog]

Have you read the headlight circuit thread in the CUCV Helpful Threads sticky?

More than likely it is the headlight fuse.

 

[iasc399ia]

Have you read the headlight circuit thread in the CUCV Helpful Threads sticky?

More than likely it is the headlight fuse.

I'll read more of the sticky tomorrow, but the headlight fuse is good to go.

 

[cucvrus]

Check that 30 amp fuse out real close. I am sure that you will find that it has been getting hot from poor contact with the fuse box. It is a common problem on these units. Easy fix but a common problem. Good Luck.

 

[MarcusOReallyus]

The fuse itself may be fine, but the contacts might not be. Also check the back of the fuse box. When those fuses get hot, they can start melting things and make a mess of your fuse box. There's too much load on that one circuit.

 

[chesapeake]

Does the LMC harness help this issue?

 

[Skinny]

I would say yes and no. The LMC will take much load off the headlight circuit since now all it does is activate a relay. If corrosion or weak connections exist in the stock circuit, it may be enough of a problem to cause headlight failure but not enough to turn off the LMC relay setup.

 

[cucvrus]

No need to go thru with adding the new harness. Just cut out the wire from the buss bar on the rear of the fuse panel and put 2 in line sealed fuses in place. I have trucks that have been repaired this way for 20 years and never replaced a fuse again or had any light issues. Do what you want its your truck. I always try the inexpensive route. And it keeps the Chinese made LMC harness off my US made CUCV. That is my opinion only. Just for consideration.

 

[iasc399ia]

Not sure what the issue was last night. Went out this am and they worked with no issues. I will drive around a little after dark tonight to see if it does it again.

 

[Skinny]

May just have a sticky contact. My hazards don't work unless I move the button in and out about a million times.

 

[iasc399ia]

Yeah, something silly I'm sure. Checked all the grounds and the fuses and everything was fine.

 

[cucvrus]

The fuse itself may be fine, but the contacts might not be. Also check the back of the fuse box. When those fuses get hot, they can start melting things and make a mess of your fuse box. There's too much load on that one circuit.

Sir check out what Marcus is telling you. The fuse will appear fine. It may not be tight in the fuse box connections. That is what is creating the issue you are describing. Good Luck and it is a common issue with these vehicles. easy fix.

 

[Westech]

This is what I did to fi my headlight issue. I cut the diodes out of the horn circuit and took apart the fuse block and cut the power wire and feed wires for the headlights. Then put In a 30 amp breaker. No problems anymore. Took about 10 min start to finish.

 

[topgun217]

I had the same thing happen after the LMC upgrade. Turned out to be ground wire, rust and condensation. I wasn't a big deal to correct but a pia to figure out.

 

[Bob H]

I had the issue of headlights going out, bought new bulbs then found it was the connection at the headlight itself. A little dielectric grease on the prongs and put the new headlights in the box on shelf.

 

[forest522]

Top Gun and Bob have great points. My '09 had several gremlins early on after I acquired it. I spent hours, HOURS, pouring through this forum looking for and getting lots of great advice. In the end, though, and I think it was Doghead, the best advice was to carefully and slowly go through the diagrams and clean, replace, grease and re-fit much of the original wiring harness.

It is probably something silly, but a thorough cleaning of grounds and getting to know your rig's wiring was some of the best advice I ever received. Cheers!

 

[iasc399ia]

Top info guys like always. Thanks