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Old 10-08-2012, 06:24 PM   #1
Tracknod OP
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Location: Home of the Rat in Fl :(
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'51 R51/3 Ignition Terminal Questions...

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 of a diagram 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?

The board is in a replacement headlight from S. 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.

On my original cracked board from '51, the previous owner soldered some spade ends to 57(???) and 56. Notice 57 isn't labeled here either:





Should I just solder a wire in the terminal? It does get power when the switch is turned. It would seem that this is for a flat head screwdriver, but the terminal just turns.

Also, What is that light grey wire that looks to be soldered to 30/51 and what does it attach too?? It is in every picture I can see from replacement boards i have found online including Max's site. Is this for later bikes?


Thanks in advance...

Shane
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Bikes in the garage:

'09 BMW 1200 GSA
"Blü Oni"
'03 Honda VTX Bored, chopped, raked, and fat "Hassen "
'02 BMW 1150 GSA "Red Wooster"
'85 Honda CBR 900 Cafe'd For Sale
'83 Suzuki GS450 Bobber "HydroStream"
'70 BMW 75/5 Cafe'd "She Devil"
'38 BMW R71 Hack Jackie Chan Edition "Slow Boat"

Tracknod screwed with this post 10-08-2012 at 07:38 PM
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Old 10-09-2012, 04:30 PM   #2
Tracknod OP
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Ok...

The /2 Guru Vech came through and answered my question that I cross posted on the /2 list.

Here is his reply:

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 is the answer in case anyone ever needs it. Search little google bots, search.
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Shane

Bikes in the garage:

'09 BMW 1200 GSA
"Blü Oni"
'03 Honda VTX Bored, chopped, raked, and fat "Hassen "
'02 BMW 1150 GSA "Red Wooster"
'85 Honda CBR 900 Cafe'd For Sale
'83 Suzuki GS450 Bobber "HydroStream"
'70 BMW 75/5 Cafe'd "She Devil"
'38 BMW R71 Hack Jackie Chan Edition "Slow Boat"

Tracknod screwed with this post 10-09-2012 at 04:37 PM
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Old 10-09-2012, 10:19 PM   #3
bmwhacker
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I can't believe that the hundreds of 1951 R51/3 owners around here aren't speaking up?
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Old 10-09-2012, 11:20 PM   #4
Tracknod OP
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Quote:
Originally Posted by bmwhacker View Post
I can't believe that the hundreds of 1951 R51/3 owners around here aren't speaking up?
LOL... Well it is practically the same board that would be on any 2 cylinder BMW from 51-69 so I figured someone might know. I mean that is a couple hundred thousand bikes. That covers R51/3, R67/1/2/3, R68, R50, R69, R60, R50S, R69s/, R60/2, R50/2 and probably almost identical to all the singles as well....
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Shane

Bikes in the garage:

'09 BMW 1200 GSA
"Blü Oni"
'03 Honda VTX Bored, chopped, raked, and fat "Hassen "
'02 BMW 1150 GSA "Red Wooster"
'85 Honda CBR 900 Cafe'd For Sale
'83 Suzuki GS450 Bobber "HydroStream"
'70 BMW 75/5 Cafe'd "She Devil"
'38 BMW R71 Hack Jackie Chan Edition "Slow Boat"

Tracknod screwed with this post 10-09-2012 at 11:56 PM
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Old 10-10-2012, 12:18 AM   #5
Bill Harris
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Heck, almost that same board is used on the /5. I guessed pretty much the same thing that Vech advised, but since I din't know fer sure, I kept quiet. I imagine that the PO soldered to 1/4" female fastons to the two "slotted" posts to keep from having to solder in such close quarters. Not a bad idea, IMO.

It is so BMW-esque that they used the same board through the /5 years. Even down to the not-ever-used Terminal 2, the "magneto kill" ground contact. The board in my /5 is almost 40 years old and has been removed, repaired or refurbished 3 times, with the aid of a junk donor-board.
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