This has happened to me a few times. I just take the unit out (3x 8mm bolts IIRC) and then pull the unit apart to clean it. I will then re silicone it, as well as around the base of my bulb (I use 7005 bulbs for more power and they mostly fit). Put it all back in and there you go. 15 minute job.
Good luck. And hello I am new here but quite enthusiastic about my ranger.
Should be a 4.6 swap in the future..........
