My lights have been great since I fully rewired the truck with an EZ harness. The lights flickered before the rewire, were fine for a while, then started flickering again. Only the high beams flicker though. Any ideas guys?

 

 

Check grounds, headlight switch, and high beam switch.... could also be a bad crimp too.

Dunno how ya did it but personally, I would solder and heat shrunked the splices.

Does it flicker with the engine off? Meanimg, is it vibration sensitive?

 

Will do. Which splices do you speak of? It does it with the engine on or off. Thanks for the reply!

 

There is a aftermarket headlight harness on LMC or ebay that plugs in to bypass the headlight switch and take power directly from the battery.. Solved my flickering problem..

http://www.lmctruck.com/features/cc/ccc4l.htm

 

I may look into that. Of course this morning the lights are perfect. What gives?

 

Hey dewd,
Since this has been an issue before your harness, I would suspect the actual switch being the issue. Since I didn't want to run my wires to the high beam switch on the floor, I used a toggle and ran it to a relay for the high beams. Actually works great, but I sometimes forget it is on.

 

As I understand it, the higher load will heat up the light switch causing it to cut out then cool and start again then the cycle continues.. As it wears the flicker gets worse.. I may be wrong of course, but since I installed the harness all high current is off of the switch and is now used to trigger the relays..

Plug and Play Harness are way cheaper searching around cheesebay...

http://www.ebay.com/itm/OEM-H4-Headlight-Relay-Wiring-Harness-System-2-Headlamp-Light-Bulb-Fix-Dim-Light-/310882156217?_trksid=p2141725.m3641.l6368

 

You should do some diagnosis here first. There is a thermal circuit breaker inside the headlight switch that will cause this if the circuit is overloading. A clue is it's only happening on the high beams, so the switch could be getting weak but consider the rest of the system before you condemn it. How old is the dimmer switch? If you just replaced the harness you've eliminated a lot of the resistance the old harness had so what components are still old in the circuits? Make sure you don't have both the highs and low beams coming on when you switch it to high beams.

All good with the relay setups, just make sure there isn't a short somewhere else that is going to fry your new harness.

 

Thank you all for the suggestions. The dimmer switch is brand new. The old components are the light switch, voltage regulator, the pigtails for the lights, and the sockets for the bulbs. I just cleaned the grounds.

 

I recommend getting the relay harness... stops the high amperage from going through the switch. Even with a new headlight switch my lights are brighter with the relay setup. Gives you new sockets for the lights too.

 

...You're saying that your rig hasn't been received the headlight relay upgrade when the EZ wiring went in? That would-should have been the one of the first things to do (after mechanicals and such).

Do it!!!

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I used th harness from LMC, along with the updated headlights had to grind out the buckets a little bit not a big deal, they fit and look awesome, no issues with flickering
Hiosilver is right "do it"

 

I will give it the light switch and some time, if it doesn't work, I will purchase and install the harness.

 

I was thinking more about this and something sounded familiar.....
https://www.ford-trucks.com/forums/1...on-switch.html
Perhaps it is just the wire in the switch block that has loosened and is making minimal contact.