I'm french and discovered your community today ....may I help you ?
you can download the repair manual there :
http://lekorbo.free.fr/mz/manual/choose the largest file, best quality of pictures
the shematic diagram is at the end but for RT 2000 (and upside down, sorry, not my fault), it seem your RT is post 2005 model so some changes are possible
you can download the 2005 shematic diagram there :
http://imagik.fr/view-rl/74762the colors on the picture are not true, I done them to find easily where each wire is going, the real colors are written ... for example Rt/Sw mean Rot /Shwartz (= red/black) it's in German (sorry), and explanations in French (sorry too)
the main change between 2000 and 2005 is the number 36 part wich connect the the headlamp only when the motor is running
as Steve said the indicator relay is under the seat and you will find a connetor with 3 wires (see page 122 of the repair manual):
- brown for ground
- red/black for +12V
- blue/black going to the commutator (is it the correct word ?)
can you excuse me for my bad english