Those led bulbs have a polarity. They only work one way. Try pulling it out and rotating 180 degrees, reinsert. You don't need a relay. They draw next to nothing in current. Very unlikely you shorted while replacing these. Also get a torch and magnifying glass and have a look inside the bulb holder to check for anything that might obstruct contacts.
Cheers, Richard ~~~~~~~~~~~~ 09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge
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