Hi - I just bought a set of Morette tails off a member here about two months ago and have had some issues with the bulbs lighting up. One set of brake lights lights up but one bulb is fainter than the other, even after replacing the bulbs, and the other set of brake lights doesn't light up at all. Has anyone had this problem before or have any ideas as to what I can do to fix this problem? Much thanks!

You need to look for bad connections. Using a test light probe will show you where power is getting to.