I need a colored wiring diagram - 1989 R100RT

[Mallo81]

Hello everyone,

I’m rebuilding my BMW R100RT and I’m having hard time finding a colored wiring diagram.
The bike is a monolever, year 1989.

The diagram I have on the Haynes (not colored, but I can live with that) doesn’t seem accurate to me.

For example it shows a light-dimmer switch/control that the bike doesn’t have (I turn on and off the light with the ignition switch, turning the key 1 except for the high beams)..

Thank you in advance for your help!

[SteveD]

Hello everyone,

I’m rebuilding my BMW R100RT and I’m having hard time finding a colored wiring diagram.
The bike is a monolever, year 1989.

The diagram I have on the Haynes (not colored, but I can live with that) doesn’t seem accurate to me.

For example it shows a light-dimmer switch/control that the bike doesn’t have (I turn on and off the light with the ignition switch, turning the key 1 except for the high beams)..

Thank you in advance for your help!

You will find that the Euro v US wiring was different. Headlight on and off is the usual one. I guess it's more likely to see a diagram with it all in, to cover all areas?
What's your location?

[Rob Frankham]

The latest Haynes (1999 edition) has coloured wiring diagrams which cover both US and Euro models... although on the same diagram with notes which isn't particularly clear. I've yet to find a completely reliable wiring diagram in any of the manuals or even from BMW themselves... sometimes you just have to rely on logic and common sense.

Rob

[barryh]

I have a fabulous colour diagram but only for the early R45/R65. It's crystal clear no matter how much you zoom in. I've printed it out A3 for easy reference. I realise none of that is much help but the point is that if a company produced such a diagram for the relatively obscure type 248 models they surely did so for the more mainstream airheads so they must be out there somewhere. The diagram has this watermark on it:

WWW.2-ventiler.de

[Kurt in S.A.]

I've heard a few people tout the diagrams sold by Euro MotoElectrics.

Kurt in S.A.

[Mallo81]

Thank you guys. I’m tempted to buy those EME diagrams..
Ii just do not want to spend $30 on a useless piece of paper..

[gspd]

This might help, it's for a 88-'90 r100gs.
Should be close enough (maybe identical?) to a RT to resolve most issues.
It's a jpeg, so it gets blurry when you zoom in.
I can email you a PDF format so you can zoom in all you want and it stays clear if you send me your email address.
Not sure how to post a PDF here.

The second one shows the U.S. vs. euro headlight wiring by-pass.
By the mid '70's, North American motorcyclists were not deemed intelligent enough to determine when their lights should be 'ON'.
By the mid '80's, Canada implemented a daytime 'headlight 'on' law for all vehicles so motorcycles could blend inconspicuously into the traffic flow even with their lights 'on'. Go figure.....

[Mallo81]

This might help, it's for a 88-'90 r100gs.
Should be close enough (maybe identical?) to a RT to resolve most issues.
It's a jpeg, so it gets blurry when you zoom in.
I can email you a PDF format so you can zoom in all you want and it stays clear if you send me your email address.
Not sure how to post a PDF here.

The second one shows the U.S. vs. euro headlight wiring by-pass.
By the mid '70's, North American motorcyclists were not deemed intelligent enough to determine when their lights should be 'ON'.
By the mid '80's, Canada implemented a daytime 'headlight 'on' law for all vehicles so motorcycles could blend inconspicuously into the traffic flow even with their lights 'on'. Go figure.....

Thank you! Very useful and the definition is clear enough.

Then again my point: in all these diagrams the lighting switch seems separate from the key-ignition switch, like if it was a specific switch/control on the handlebar. Which I don’t have.

On my handlebar I only have high-beams (on/off, not even flashing): do you guys have the same on your bikes? (See pic here)
Or maybe it’s just me who cannot read those diagrams..

[gspd]

This is the 'EURO' switch with the headlight function.
Available from BMW.
NOT 'plug'n'play.
You have to switch a few wires around.

Note to Mel: EJECT function keeps passengers 'quiet' and on their best behaviour.

[Mallo81]

This is the 'EURO' switch with the headlight function.
Available from BMW.
NOT 'plug'n'play.
You have to switch a few wires around.

Note to Mel: EJECT function keeps passengers 'quiet' and on their best behaviour.

I like the EJECT function! Lol

It’s an aftermarket switch.. which probably matches the wiring diagram more than the actual original production control!