Typically the power comes from the fuse box (from a circuit breaker labeled "headlights") to the headlight switch then through the headlight switch to the high/low beam switch.
Do your headlights work on low beam?
Do you have a circuit breaker or fuse labeled "high beam" as you said "you have no power at fuse box".
On my coach, there is one circuit breaker for Headlights and there is a terminal strip (located in front Run Bay compartment) with studs/wires labeled "Lo Beam" and "Hi Beam", so the power flow is through circuit breaker to headlight switch, from head light switch to hi/low beam switch, from that switch power goes to the terminal strip and you would be able to test for power (using a 12V test light or voltmeter) at the terminal strip while switching from hi to lo beams.
I know your post asked if anyone knows the part number for the hi/low beam switch. I can't help with that, but if you could post a picture of the switch, there may be someone else who will recognise it and be able to help.
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