You mean the running light isn't bright or when you push the brake the lights not bright? Because my YJ's running lights are dim as heck, but when I hit the brakes its bright, since the light gets all the 12V
something is wrong with your jeep then, bake lights and turn signals are bright.
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chances are no. i would do a quick voltage check with a meter. If your not getting a full 12v when the brake is pressed or when the turn signal flashes then you most likely need to check the wires. They could have become corroded and may need replacing. Very common in many Jeeps due to the Exposed interior.
Dang those are pricey for me anyway. But they will work great as long and they are getting the right voltage. Are you running any after market stereo, amps, or anything that might be drawing a lot of power consistantly?
Touch the black lead to the frame of the jeep. Pull out the light bulb and touch the pins under the bulb. Try this with the lights on, and then with the brake depressed. There should be two small round conntectors under the bulb of the tail lights. The turn signal should only have one connector under the bulb. Just curious but Did you clean the mud off the lens of the Tail light? (its a jeep thing) Just a joke!!
I would try new "normal" bulbs before spending too much money. Just to be sure its not a dim bulb... Sometimes the bulbs are crap and just don't seem to shine like they should. Especially the older style like we use.
these guys mention a ground problem, it could be. But, you may just need to pull the bulbs, clean the brass and put it back in.