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tracknod
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VBMWMO #8199
Joined: 01/08/2012
Posts: 14

Hello All,

I am trying to rewire My R51/3 and am running into a problem. First off, I am using the correct manual which has this Hi Res wiring Diagram:

This is basically a higher res image off Duane's site of this:

Here is my board in my new bucket:

Now everything is connected, except my two questions.

What is terminal 57 and if what I pointed too is it, like in Duane's image suggests, how do you connect to that? Terminal 56 has a wire connected to the underside of the board that is going to the dimmer/horn switch, is there supposed to be a wire connected to the not labeled terminal in a similar fashion?

Also, What is that light grey wire that looks to be soldered to 30/51 and what does it attach too?

Thanks in advanced...

Shane

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6423
Shane - Is this a replacement

Shane -

Is this a replacement board? Maybe the board is somewhat generic, as I thought a lot of boards during this time looked similar.

As for #57, can you check continuity between the spot on the board and terminal 57 on the parking light? That would confirm what 57 is on the board.

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

tracknod
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VBMWMO #8199
Joined: 01/08/2012
Posts: 14
Thanks Kurt, The board

Thanks Kurt,

The board is in a replacement headlight from Meyer in Germany. My original board in my bucket was broken in half and would kill the bike if I hit a bump causing me to have to open the shell and fiddle with it which became a pain.

It is the same replacement board that they sell.

So, the terminal I pointed to, does get juice if the switch is turned to it so I am assuming it is 57. But how are you supposed to connect to it?

On my original board from '51, the previous owner soldered some wire ends to this:

Should I just solder a wire in the groove? It would seem that this is for a flat head screwdriver, but the terminal just turns.

Any idea what the grey wire is? It is in every picture I can see from replacement boards i have found online including Max's site.

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6423
Interesting the way those

Interesting the way those spade connectors were soldered to the slotted screws! I haven't been able to find anything that has that gray wire in it. I have the Doug Rinckes book (version 2) but it's only for the R25-on singles and /2 singles. However, there's some similarity between the R25/2 or /3 wiring diagrams as the R51/3 that you show...probably makes sense as they were from the same period.

Darryl and others have R51/x models...hopefully they'll come along and provide better guidance. Sorry....

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

tracknod
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VBMWMO #8199
Joined: 01/08/2012
Posts: 14
Vech Answered...

Vech answered my question on the /2 list today and wanted to post his answer here so it could be searched for by anyone in the future.

Here is what he said:

Quote:

Shane,

I have a brand new board in my hands for the R51/3 and I am comparing it
to your board in the photo.

Of the two slotted posts in your photo, the one you are pointing to,
with the question "is this terminal 57"
That post you must solder a wire to, and it goes to the park light bulb
under the headlight bulb in the reflector.

The other post, with the slot, to the left, of the one you asked the
question about, is where two wires are soldered.
One wire is the power to the high/low beam switch on the handlebar. The
other wire goes to the speedo illumination bulb. It appears to me that
the yellow wire with the red tracer is attached to the upper side of the
post, above the board. I have no idea where you ran that yellow/red wire.

The grey wire. That is not supposed to be there. That "button" that
it is soldered to, is the head of a rivet, that holds the forward
contact bridge to the top of the board. The other anchor point for that
bridge is the terminal 58. So, just to satisfy your paranoia, take the
wire off 58 temporarily, and use an ohm meter to confirm that the grey
wire, and #58 are common and show continuity, which they will...........

--
Sincerely,
Vech
Bench Mark Works, LLC
89 Earles Fork Road
Sturgis, MS 39769
662-465-6444
http://www.benchmarkworks.com
BMW MOA Ambassador #9462

So there it is. You do need to solder a wire to the unmarked 57 for the parking light and the grey wire is the same as 58 which is the center wire of the horn.

Thanks Vech!

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