1999 suburban k2500

Front parking lights and rear tail lights do not work
have no problems with brake lights, turn signals
front or back, reverse lights and all dash lights
work. Just no tail lights and parking lights in front.
Replaced #9 fuse no luck checked power at brown
wire with switch on .03 volts if I remember
correctly and was in 20 dcv setting have no clue
when it comes to electrical and have to drive early
in the mornings please help.