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My first guess would be a ground problem. The headlights and tail lights are controlled by the same headlight switch, but the brake lights are on a totally different circuit. You may have to get a shop manual to get the wiring diagrams needed to troubleshoot the circuits if the ground connections are ok. The lights involve the body computer and other components.
The relay on our 1999 Jeep Grand Cherokee was located behind the headlight on the passenger side of the vehicle. technicians at the Jeep dealership that you have
to remove the bumper to get to it OR you can remove the headlight
assembly and drill a hole large enough to get a socket and extension to
the bolts on the relay..removed the headlight and
drilled a 5/8" hole to get to the relay screws.
Why Jeep puts this relay in such a hard place to reach is beside me - - -
other than perhaps they don't want it to be easily customer
replaceable. Argh! Good luck.
I is under the passenger side headlight. I have had to change mine a few times now. The proper way to do it is to remove the front bumbper to gain access. Crazy I know. The jeep dealer showed me a quicker way. Remove the headlight, cut a hole through the bumber under the headlight( you won't see the hole as the headlight will cover it up), and this will give you access to the relay.
The headlights on my Tahoe are dim too. It's also a 1999. I replaced my bulbs with Silverstar's but it was still dim. I used Mequiar's Headlight kit to polish off the yellowing and oxidized headlight's and it really made them look good but they are still not bright. They look bright but the light hitting the road is still weak. It's because the inside of my headlights are a little bit cloudy still. The heat damage from the bulb made the insides cloudy and the light is still weak on the road at night. That's all I can do unless I replace the headlight assemblies. Much money and not super simple to do. I have very bright bulbs just cloudy housings that still don't allow the beam to fully shine through. I don't know if that is your issue but I hope this helps.
The relay location depends on what style cherokee you have. Grand cherokee's are located behind thepassenger side headlight which involves removing the bumper cover and grill.
On the older style cherokee such as the sport there located in the engine compartment fuse panel.