Looking for wiring diagram for instrument panel on BMW R1100 rt.

moved you out of , cars to motorcycle had to guess last missing model letter (S)
the users manual covers this and is free if you search.
the service manual too covers this in spades.
2nd google hit.
free too. but is for S model and not told by you.
I had r1000s , mint restored.
https://www.manualslib.com/manual/368745/Bmw-R-1100-S.html

more here if you want

https://www.manualslib.com/b/bmw+r1100.html

all motorcycles, under see or tank .
really where else can they hide, some on headlight shell
RT'
words

1
Removing and installing central
electrical equipment box
e
Caution:
Switch off ignition.
Disconnect ground (earth) lead from battery.
Insulate ground (earth) lead.
•
Remove dualseat.
•
[RT] Remove small side fairing sections at left
and right.
•
[RT] Remove luggage rack/case holder.
•
[RS/R/RT] Take off rear fairing at left and right.
•
[RT] Remove lower rear section.
•
Take out retaining screws (1) for upper section of
central electrical equipment box.

Mark,

Electrical problems are hard to diagnose at the bike and much harder to do remotely....Here is a link to the BMW motorcycle owners discussion board, you may find some answers there...Good luck.... I miss my RT !

https://forums.bmwmoa.org/showthread.php?75034-2004-R1150RT-Dead-Electrical-System-But-New-Battery!

There are a number of comprehensive solutions for the BMW R1100 on youtube. Just search for "BMW Service".

after removing the front seat the back seat lifts up from the rear and then is removed by pulling it backwards

http://www.tradebit.com/filedetail.php/828693-bmw-r1100-rt-motorcycle-service-or-repair