help electrical problem!

i'll poise this question to confirm my opinion and maybe will add some info. IE: the brake and turn are always one "package" ( sorry i realize package is not correct auto term). the tail and side marker lights are another ????? also i've been putting dielectric grease on all bulb and wire terminals, that maybe helps plus trying to clean out inside of the sockets???? for side markers to blick with T S applied, wouldn't that mean that side marker wire if shorted to a T S wire some where ???? just wondering...