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mspa 10-10-2012 10:04 PM

Need fuse block help with my R100S
I have a 1978 R80/7 with R100S components/engine from the same year. My ignition has two positions. Park (no headlight) and headlight. I recently pulled the fuse relocator that was on my top plate, mainly to make room for my cables to have room for proper routing. There were four wires on the relocator. After pulling those out, my headlight comes on in both positions. Everything else works properly, so I figure it has to be simple.

I have no idea if my fuse block is stock to my bike, and neither Clymer's or Haynes shows this board. There is a wiring diagram in Clymer's but it doesn't reference the DIN codes. I found pics of a 1980 R100 RT/RS block that matches mine. I'm hoping that someone can help identify what is amiss.

I mentioned this in another thread, and someone rightly questioned why there is a green wire in the red area at position 30. But I pulled it off and nothing changed. What I am really wondering is if it makes a difference which post you get in a coded area, as long as it's in the right area. I assume that since there are contacts on the back that cover the area, this would be correct?


Board front.

Board back.

RecycledRS 10-10-2012 10:27 PM

Think the green wire doing on terminal 30 (red board terminal) maybe the problem. I think this should go to top fuse terminal (green board terminal un-fused side). It looks like those terminals are already used but I can not see with what wires (they are covered by a cable). Having the green on that terminal would power the light all the time when switch is on.

mspa 10-10-2012 11:06 PM

If you are talking about 15U, as the un-fused side, those both are green wires.

I'll look in there tomorrow and see where those go. I know at least one goes to the ignition.

Boxer Metal 10-10-2012 11:36 PM

#30 is always red and always hot. Green or green/black are only hot with the ignition turned on.

RecycledRS 10-10-2012 11:58 PM

Guess I must be colour blind (terminal 30 - with a green wire)

Boxer Metal 10-11-2012 12:09 AM


Originally Posted by RecycledRS (Post 19793257)
Guess I must be colour blind (terminal 30 - with a green wire)

Never in any German wiring, car or motorcycle.

Bill Harris 10-11-2012 04:45 AM

A Green wire on a Red (Terminal 30) tag is a no-no.

Kicking around here somewhere I've got a list of which color codes are customarily used with what functions (Red is always-hot main bus, White is High Beam , Yellow is Low Beam, etc), but darned if I can find it. I'll keep looking.

Here are the DIN designations I've used for years:


Ignition system
1 coil, distributor, low voltage
1a, 1b distributor with two separate circuits
2 breaker points magneto ignition
4 coil, distributor, high voltage
4a, 4b distributor with two separate circuits, high voltage
7 terminal on ballast resistor, to distributor
15 battery+ from ignition switch
15a from ballast resistor to coil and starter motor

50 starter control

15 battery+ through ignition switch
30 from battery+ direct
30a from 2nd battery and 12/24 V relay
31 return to battery- or direct to ground
31a return to battery- 12/24 V relay
31b return to battery- or ground through switch
31c return to battery- 12/24 V relay

Turn indicators
49 flasher unit in
49a flasher unit out, indicator switch in
49b out 2. flasher circuit
49c out 3. flasher circuit
C 1st flasher indicator light
C2 2nd flasher indicator light
C3 3rd flasher indicator light
L indicator lights left
R indicator lights right
L54 lights out, left
R54 lights out, right

AC generator
51 DC at rectifiers
51e as 51, with choke coil
59 AC out, rectifier in, light switch
59a charge, rotor out
64 generator control light

Generator, voltage regulator
61 charge control light
B+ battery +
B- battery -
D+ dynamo +
D- dynamo -
DF dynamo field
DF1 dynamo field 1
DF2 dynamo field 2
U, V, W AC three phase terminals

54 brake lights
55 fog light
56 spot light
56a headlamp high beam and indicator light
56b low beam
56d signal flash
57 parking lights
57a parking lights
57L parking lights left
57R parking lights right
58 licence plate lights, instrument panel
58d panel light dimmer

85 relay coil -
86 relay coil +
Relay contacts
87 common contact
87a normally closed contact
87b normally open contact
88 common contact 2
88a normally closed contact 2
88b normally open contact 2

mspa 10-11-2012 09:24 PM

Thanks guys. This looks like what I need. I have some time on Saturday to sort this out with the info you've given me!

Wirespokes 10-11-2012 09:56 PM

More data
As if it isn't obvious, the PO modified the wiring. He set up the ignition switch so there would be power on the Parking Light position.

When the remote fuse block was removed, it should have been a simple thing to remove the four wires, and install the fuses in their proper places. But there it got complicated - the lights wouldn't come on. And with wires landing in non-standard places, it wasn't possible to get it back to that configuration without understanding what was done (and why). We mucked around in there a little and managed to get the lights working again, but now they don't turn off when starting the engine.

Here's what I would do: return the wiring to stock, and then modify from there.

mspa - a data point that may have been missed - that circuit connection board is color coded to accept wires of those colors in those spots. It's properly wired when all of the correct color wires land in their matching color coded spaces. It can't get much easier than that!

The problem is making it nice and neat, with all of the wires swirling around the outer edge of the bucket, leaving the center free for the headlight - and being able to see and check out the connection board.

mspa 10-11-2012 10:29 PM

Would having the Dyna III ignition wired up have anything to do with how this got "messed up"?

I get the idea that color coded wiring should make this super simple. However, there seem to be a couple of extra green wires. If memory serves me, I think one daisy-chains out of another connector on green wire. I am fairly certain that all the wiring on the left side (as you look at the board) is fine. I believe it's the green wire on red, in conjunction with possibly a few other wires on the right side of the block that are messed up.

If I can't get it right, I'll consider finding a stock board. I am just guessing the OP put a new board in when he put the Dyna III in.

Bill Harris 10-12-2012 02:41 AM


As if it isn't obvious, the PO modified the wiring... We mucked around in there a little and managed...
Good show. Yeah, it would be agood plan to go back to stock on the wiring. Lord knows what, why, when or how the changes were made by the PO, but stock is a good starting point.

I've made changes to my wiring over the years, but have been fairly good about documenting things. Early on, I kept record of the changes on xerox copies of the wiring schematic but the past decade have gone digital and have a series of scanned schematics with the changes noted. Hopefully the digital wiring changes will go along with the bike after I check out, else the next owner may go digital, too: :ken

The "extra green wires" may be just that-- extra green wires that were included with the board because of later revisions or different markets.


Originally Posted by Wirespokes
nice and neat, with all of the wires swirling around the outer edge of the bucket, leaving the center free for the headlight

I like that.


mspa 10-12-2012 05:50 AM

When you guys say "go back to stock wiring" are you saying to get a new fuse block and wires? Or just relocating what is already there?

Wirespokes 10-12-2012 06:14 PM

Aint nuthin wrong with your fuse block! (though it isn't really a fuse block, but more a connection board) It's stock and belongs there. Absolutely no need to replace it.


The problem is the configuration has been changed. Wires no longer end where they did originally and who knows what else? It's going to take a little time with a wiring diagram and checking to make sure everything's correct. And correct what isn't.

mspa 10-12-2012 10:01 PM

Somehow I'm thinking I should be thinking about another trip to your place before the winter hits . . . but seriously, I'll take a look tomorrow. I agree with all of you that it should be the stock configuration.

mspa 10-14-2012 06:04 PM

So I am trying to get this back to stock configuration. Spent most of my weekend . . . anyway, I have all wires where they are supposed to go with exception of double-checking the ignition and the Light Relay (Bosch 0 332 019 150) http://www.texasindustrialelectric.c...0332019150.asp in which case I have found conflicting info on which 87 tab is "b". Looking around online at diagrams of the same part, I've seen switched. Shouldn't be that difficult.

The ignition is another matter. I have the diagram, but the ignition only has 58 on the far left, 30 in the middle between the two center tabs, 15 on the far right, and 56 is the diagonal, below the other tabs.

I have a red wire coming in from the harness to ignition #30 (I've tried both center posts on ignition)

Grey wire is double wire mounted at 58U on the board and going to 58 on ignition and 87 (tried both tabs).

Green wire was on wrong. It comes out of harness to a double connector that should have been on 15U on the board, then going out to 50 on ignition (don't know which tab that is, but tried various tabs).

I have a green wire going from 56 on ignition to 86 on light relay.

Using these wires as in the diagram, and trying different combos with the unkowns on the schematic that aren't on ignition, and the fact that the light relay doesn't distinguish which 87 tab is "b" . . . I'm about to pull my hair out. I can't get the ignition to work in parking AND full position.

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