electrical problem (dash)

the sockets and bulbs were brand new. everything is plug in the way it is suppose to. i also replaced the headlight switch. it had a ground tab on it so i did ground the switch. when i turn on the lights i only get the lights (two sockets) to light up.( right side of dash),it seem that only the right side of the dash is getting power. was just wondering if the left side of the dash receives power thought the light switch or some other source?