GD Sunstream 2000 1991 main beam

[racebitz]

Hi Folks

I am a wee bit stumped here: my dip beams work, but no main beams. The unit has 4 headlights, I assume 2 dip beam and all 4 main beam?
Anyhow, nothing at all from the 4 on main beam.
No power to the bulb (well the light, it is a sealed unit) when main beam is selected.
I checked fuses. Didn't know how to check the dip/main switch (it is mounted on the floor, foot activated). When I click to main beam the main beam light on the dash lights up, but it doesn't translate to the main beams leading me to believe it isn't the stitch.
Questions for my learned friends:
Should all 4 light on main beam?
Is there a relay or something i should be checking?

Thanks in acdvance.