...bulb possibly have wrong bulb or one side is burnded out. if I remeber correctly the part No#3157 it should be stamped on base of bulb these should be the 2 top bulbs.the lower reverse light
...also check your fuses if neither one works ... Brake light bulb also work's running light, bulb #
...all the fuses You probably already know this, however the GMC 2002 Yukon Denali uses the Wagner 3157 (or equivalent) dual element bulb. The running light uses one element whereas the brake & ...
replacement bulb for rear turn signal #3157
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