Sounds like a connection problem to me. LEDs don't partially fail, they either work or they don't. First thing I would do is open the hood of your vehicle, disconnect the fixture and bring it up to the battery. Then touch the leads to the battery posts - white goes to the negative (-) post, the others, one at a time, to the positive (+) post. If the lights come on brightly, then they are good and you need to look elsewhere. For whatever reason, the usual culprit is a ground connection somewhere.
Do the other fixtures light up properly?
Bill
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