My old hot rod has led lights on it and there not very bright.if you put 12 volts to them out of the car they seem really bright.been told they might have some sort of resester in line somewhere ,how would i check that? ther is only one wire that runs to each tail light to run tail,turn,stop,all work properly but to dim to see in daytime or when car is close at night.any help would be aprisiated.