Don’t think these are original. But issue is on just regular headlights the bottom right and top left are lit up. When I hit the brights all 4 light up. Not sure what it’s supposed to be or if it’s a wiring, bulb placement, or bad light issue. Just trying to get some input before I pull the grill off, headlights, and try to fix it.

 

All four bulbs are dual function hi/low beam. You have the low beam filament burnt out in two of them.

I’d replace all four while in there. Surely there’s a way to get to them without removing the grill guard bumper. Look at pulling batteries and maybe the washer reservoir fill neck. Or you might be able to get there by peeling back the fender liner. I haven’t had to replace any of mine yet so don’t have first hand knowledge.

 

👍 on front license plate!

Two top bulbs can be replaced by removing the air filter box and filler tube for windshield washer reservoir. I don’t know about the two bottom bulbs.

 

Quite a few youtube vids on how to replace the headlight bulbs.

 

I have a '17 and all four can be replaced from the backside with out removal of anything. It can be tight, but its doable.

 

10-4 appreciate the help. Ya I’ll do some digging on easy way to switch the bulbs out! Planned on removing the grill and lights because I didn’t know what I would be getting into as far as wiring and whatnot. Thanks again!

Well there’s the video! Thank you. Great to be back in a truck that has some support behind it. Been building a F750 and info on those truck is impossible to find. Even at the dealer.

 

Glad to help.............it's what we are all here for.

 

Pull the intake snorkel on the passenger side and the washer reservoir fill neck on the driver side. You can reach all bulbs

 

All 4 bulbs can be also accessed from the bottom by pulling back the fender liners a little as well.