Have a 99 XJ. been having problems with the head lamp since I bought it.
They work low/high but there not bright. I changed them over to to H4 bulbs, lil brighter, then I bought a HID kit, even brighter. But, not as bright as my 92 XJ. I have the same alt, battery, and headlamps setup on both jeeps. The 99 is my wife's and she drives it at night, so I need to get this fixed ASAP. Anyone having the same problem and know what I need to do to fix this?

 

Does their brightness change when you have other loads on the electrical system? Fans, radio, etc. I use the Sylvania Xtravisions or whatever they are called. I get flashed anytime I'm driving at night when my dims are on because they're so damn bright.

 

I had this problem and instead of sinking more money in a bought beam lights from walmart and aimed them between my high and low they are 20x brighter than my heads

 

You could try using a meter to test the voltage @ the headlight base (socket) with the headlight on. I would expect the full 12 volts at the socket. If there's less, look for a loose connection or bad switch.

You could also try running a ground from the frame or - battery terminal to the ground terminal of the headlight base (again with the headlights on) and see if the brightness changes.

 

Could be that the reflective coating on the rear of the lens has gone south. I changed my lights recently because of this.

Rob

 

check the ground circut?

 

I had to change the light housing for the H4 AND HID lights, its no longer
the headlamp bulb. I dont have a meter to check the voltage, I have to wait till Monday to do that at work. The only time the lights dim more is when I turn on the PIAA fog lights, thenthe alt. kicks in and its ok.
These are the lights I installed;
This is a pair of H6014/H6052/H6054 Chrome 7x6 crystal headlights Conversion with Bi-Xenon Double Filament H4 HID Conversion Kit. The exact size for these headlights is 7x6. These headlights are with clean crystal design with crystsal housing, which gives your car the latest Euro style. This package comes with HID kit that contains two H4 H.I.D (High Intensity Discharge) Hi/Low light bulbs, two ballasts with built-in starter and igniter, two secure mounting brackets, zip ties and Adhesive tapes. This product is a 35W HID conversion kit that produces a 8000K Blueish White light output. This aftermarket HID conversion kit is a perfect upgrade for your OEM headlights if you do not have stock HID system. Get these 8000K Blueish White 35W HID Xenon kit today and give your headlights a HID light output.

 

might want to upgade alt to

 

......headlights are aimed too high and blinding oncoming drivers.