get a volt meter and check your grounds, You want them to be less than 2 ohms. If they aren't then you wont have bright lights.
Do this by clamping one end of the meter to your Neg terminal and then touching the other to your ground points. A good meter goes for about 50 bucks and no one should be without one.
Jeep: Pioneered by a war, popularized by AMC, revived by Chrysler, jacked by some Germans, and copied by all.