R1150RT headlight issues

[Afield]

Hello all,

My R1150RT-P headlight has stopped working.  I need some help figuring out what its problem is.  Here are the facts:

1) High and low beams do not work.  Fog lights also do not work.  The small running light does work.  According to a layout of my fuses, the headlight is unfused.  

2)  I have a set of driving lights mounted but they are wired to a different wire.  I used this wire (one of the RT-P leftovers) because it was hot when the lights are on.  (On the RT-P, you can turn the lights off.)  When the lights are supposed to be on, these driving lights are on.  

3)  All four bulbs light when juice is provided directly.  The low beams and fog lights all light when juice is applied to the plug that enters the light assembly.  I couldn't get the high beams to light, but was just guessing at red/black combinations on the 4 holes on the plug.  

4)  The brown ground wires appear to be in good shape, at least the parts I can see.

5)  When I apply the leads of a multimeter to the male end of the plug going into the headlight assembly (the end that is mounted on the bike, not the headlight) I get no reading for any combination of red/black on any of the 4 plugs.  

6)  Hoping it was the plug, I checked the ends of the wires going into the plug.  Same deal, no juice.  

7)  I suspected perhaps the high-beam switch and have started to disassemble it but it's getting scary.

Any advice on taking that switch apart or on looking elsewhere, please send it!
I'd love direct email replies at fieldt at gmail.com in addition to posts here for posterity.

Thanks in advance,

Andy Field

[MK96xj]

Relay? With most of my bikes the head lights are driven via relay to shut off during cranking of engine.

[Andrew]

Not sure if they are the same but here is the layout of the relay/fuse box of an R1100GS, notice that the headlamps are unfused and are controlled by the load relief relay #4. Some have even gone to the trouble of adding fuses to the headlamp circuit. (not too hard but you need access to under the relay box)

[Afield]

Thanks guys.  I have that same diagram and checked the load relief relay.  I put the fuel pump relay in its place and nothing changed.  With the key on, when I install the relay the tail light and driving lights come on, so the problem is not the relay.  Any other advice?