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R69SR90SR100S
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Perth, Western Australia
Joined: 01/15/2012
Posts: 27

This one has got me beat.

I have three relays under my gas tank. From left to right looking at them:

The first is a horn relay - it's pinky purple in colour and plugs into a mount. I have confirmed its the horn replay because when I pull it out the horn doesn't work!

The second is metal. I presume its the starter relay. It also plugs into a mount.

The third is mounted by a screw on the frame next to the starter replay. There are four wires that go into it (#13 green with a purple stripe, #5 red, #10 brown and #8 green with a black stripe). The red is +, the brown is -.

Now...I can't start my bike. I think it's because the third replay was all burnt out. But what is it? How do I order one? I tried to use the horn replay on the wires but nothing happens.

Anybody know?

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Regards, Mike

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6327
A bike model might

A bike model might help...although I think we can rule out the R69S. However, in looking at the R90S or R100S wiring diagrams, I can't find any purple wires or terminals like 13, 5, 10, or 8. Mostly, terminals are 30, 50, 86, 87, etc. BMW used pretty standard relays.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

khittner
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VBMWMO #8223
Joined: 02/15/2012
Posts: 364
From the title line, it's an

From the title line, it's an R100RS. A year might help, though. My quick glance at my Haynes manual didn't help ID the mystery relay, but it was a quick glance.

Konrad

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Konrad

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6327
Oops...missed the

Oops...missed the title...went right to the topic...I was using his username to figure out what bikes he had. Still can't find anything on any diagrams with those terminal numbers.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

c.d.iesel
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VBMWMO #5514
Darien, Connecticut.
Joined: 08/08/2007
Posts: 363
no start no cranking ?

Quote:

your 3rd relay is a Headlight relay

yes - your #2 relay is the Starter relay

are you sure the red starter lock-out switch
(emergency STOP switch) over on the right handle
bar is not in the "OFF" position ?

understand your circuits

do a little more probing with a volt meter
and why might that 3rd headlight relay be
all "burnt out" up????

The Headlight relay does connect with
black wire to the Starter relay - but
anything is possibly wrong when it comes
to wiring/previous owners/and decades
of molesting

IT IS A NO STARTER MOTOR CRANKING problem i assume?

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VBMWMO#5514- '64 R27 15K #383851 - '86 R65 22K #6128390 - '13 Fiat ABARTH #DT600282 - '11 FORD TRANSIT Connect #058971 - Retired m/c road racer (1971-2000) - Former M-Benz Star Tech 19 years, BMW Master Tech (cars) - Certified BMW (bike) Tech. Presently BMW Car Sales

R69SR90SR100S
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Perth, Western Australia
Joined: 01/15/2012
Posts: 27
Relays

It's actually a 1977 R100SRS, which should be similar to the R100RS.

The headlamp relay is in the headlight?

The red and brown wires are on constantly. The green wires: one is negative and the other is off until the ignition is on and then it's on. This would energise the relay and connect the red and brown - presumably allowing the starter to turn.

It's BMW original - no "user updates".

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schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6327
Here's the 1977 wiring

Here's the 1977 wiring diagram:

http://www.powerboxer.de/images/stories/schalt_wart/schaltplaene/im_04_s...

with the legend:

http://www.powerboxer.de/images/stories/schalt_wart/schaltplaene/im_04_s...

I'm definitely having trouble finding this third relay and wiring terminals. The headlight relay does appear to be in the headlight.

BMW used DIN wiring standards. This page shows the terminal numbers in the standard. In looking through this, I can see the typical numbers in the /7 wiring diagram - 30, 50, 85, 86, etc. - are all reflected here. No 8 or 13.

http://www.isham-research.co.uk/quattro/wiring/Typ85/terminals.html

If you can do it, a good picture might help.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

R69SR90SR100S
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Perth, Western Australia
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Posts: 27
Relays

A picture wouldn't do a lot of good I'm sorry to say.

The third relay originally burnt out on a roadtrip and the garage I stopped at fitted a standard relay (which was a black plastic thing).

The black plastic relay melted on way home and I threw it out. I also didn't keep the other one - I didn't think about it at the time!

The R100SRS was originally planned as a police bike.

So all I have is the wire colours, the numbers on the wire terminal covers and the starter won't turn over the bike.

It might be a load shedding relay or something like that.

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R69SR90SR100S
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Perth, Western Australia
Joined: 01/15/2012
Posts: 27
Yep they have an Australian

Yep they have an Australian compliance plate fixed to the top of the swinging arm. They are real. I have two of them Big Grin

Anyway, After a day spent with a Power Probe I (great tool) the answer is…drum roll…

The second replay, which is the starter replay, was broken. Got an $11 one from the local Auto shop and it kicked straight away. Moral of story – check the obvious things first and don’t fall for the non-related problem (melted third replay). And of course, because I had the relay removed the power was cut to all circuits (87+87a)! :oops:

Now…for the third replay – a bit more complex.

It looks like the third replay is an indicator and hazard circuit energising replay.

After some detective work – I believe that this is the way it is supposed to work: The green and black wire goes positive on ignition on. This couples with the brown wire (earth) to trigger the replay. The red (positive) and green and purple then energise the indicator and hazard circuit energising replay. This means that the indicator and hazard circuit only works when the ignition is on.

Looking at the hazard switch wires – a wire has been jumped, which might have been a factory adjustment. I have attached a couple of photos on this switch.

Recall that this bike was one of 25 built for the Australian Police force so the hazard circuit might have had additional power items – hence the relay.

Does the power on only hazard switch sound normal?

Does the wiring going to the hazard switch look normal?

Not sure if these links will work here:
http://i749.photobucket.com/albums/xx136/mtsmini/P3310088.jpg

http://i749.photobucket.com/albums/xx136/mtsmini/P3310089.jpg

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c.d.iesel
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VBMWMO #5514
Darien, Connecticut.
Joined: 08/08/2007
Posts: 363
bundle 0 green blue wires

yes - that bundle of blue/green/brown wires are turn signal lights
circuit - not sure when BMW started - but later /7 came Pre-Wired
for 4-Way Flasher kit installation. The harness pictured is waiting on
frame for the Hazard Flasher installation parts which contains
the relay,push-on switch mounted at trim panel below
the instruments, and a short harness from the switch to
the pistured relay. I have this installed on my late
mono-shock R65 (R80). Look to the parts cataloge
for the accessory 4-Way Flasher kit for more details
and part numbers

see parts diagram 61_0247 (R65 R80), " installing set hazard warning "
see parts diagram 61_0215 (R100 1976-84) " same "......"........"
http://www.maxbmwmotorcycles.com/fiche/DiagramsMain.aspx?vid=51647&rnd=0...

heres your hazard warning harness - still available today

part no. 61 12 1 243 071 = $145

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VBMWMO#5514- '64 R27 15K #383851 - '86 R65 22K #6128390 - '13 Fiat ABARTH #DT600282 - '11 FORD TRANSIT Connect #058971 - Retired m/c road racer (1971-2000) - Former M-Benz Star Tech 19 years, BMW Master Tech (cars) - Certified BMW (bike) Tech. Presently BMW Car Sales

stoopingcranes
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Oakland
Joined: 03/24/2014
Posts: 3
new style hazard switch with old style four way hazard harness

I have a new style switch, two wire, going into the connector of the old harness, the old switch is not available. Does someone have a wiring schematic or help in how to wire these dissimilar connectors. Thank you for your time.

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6327
Welcome to the forum! What

Welcome to the forum! What model bike are you asking about? We need to know that in order to understand the functions required in your wiring harness. It might be difficult to make a two-wire switch work with a four-wire circuit.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

stoopingcranes
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Oakland
Joined: 03/24/2014
Posts: 3
model of bike

1990 r100rt, thank you for the welcome.

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6327
I don't think this answers

I don't think this answers your question but this figure shows the hazard switch from the BMW electrical CD. This suggests to me that anything less than an OEM switch is not going to have the functions that you need. This is pretty much over my head to try and find a way to shoe horn this in.

  • hazswitch.jpg
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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

stoopingcranes
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Oakland
Joined: 03/24/2014
Posts: 3
thanks

I have that diagram, i believe getting them to work together is over my head also. Thank you for your time.

GearHeadDiver
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VBMWMO #7685
Joined: 09/13/2009
Posts: 32
Hello, Has you problem been

Hello,

Has you problem been resolved?
I have a 1977 R60/7 that started its life as a French police bike......and I have the same flasher unit/circuit.
I have begun putting her back together, as I purchased her in pieces.
I have had nothing but trouble / problems with the wiring.

At the moment, all lights work except the left ones.....except when the flasher button is used, then the left flash but the right will not.

Wiring is NOT MY THING! lol

I have the wiring diagram for the 4-way (hazard) flasher setup....I can email it to you if needed.

Ashley

mcclymont(at)xplornet(dot)com

Kaptainkid1
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United States
Joined: 07/17/2015
Posts: 5
1977 R100SRS

Can you upload a photo of your bike?
I've very interested to see which parts you have on the bike.
I assume it's a 1977 R100RS with S fairing right?
Can you also take a detail photo of the Special Australian Vin tag on the Swing arm.

I have one and I want to match up my bike with these special order bmw bikes.

  • img_2889.jpg
  • 20150713_180813.jpg

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