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Old 04-28-2012, 03:42 PM   #1
lancruza OP
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R75/5 ignition switch wiring

I am going through and trying to straighten out a hack job on 1972 R75/5 project. I' have 2 different wiring diagrams for a 1972 R75/5 with fuses. One diagram is from my Clymer manual and it shows that in the on position there are 4 connections bridged together(blue circle), and the other diagram(red circle) shows that brown(ground) is connected to green only and that red and red/green are connected to gray only. Does anyone know which of these is correct?
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Old 04-29-2012, 05:57 AM   #2
rusty44
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I've found these schematics to be accurate when I used them......Al


http://bmwmotorcycletech.info/SchemSlash5.htm
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Old 04-29-2012, 10:32 AM   #3
wirewrkr
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Big Thumbs up on Rusty44!
The ONLY diagrams I use with any confidence at the WireWerkes are the factory ones like Rusty showed.
Learn to live without the pretty colors.
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Old 04-29-2012, 11:44 AM   #4
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Yes, I actually have that one also. I'm going to show my ignorance here. I couldn't figure out how to read that diagram as far as being able to tell what connections are made when the switch is closed in "parking" mode or in "on" mode. If one of you enlightened airheads could decipher this for me it would be greatly appreciated.
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Old 04-29-2012, 01:00 PM   #5
Bill Harris
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The switch in the factory schematic is a pictogram-- it looks just like the switch does in real life. Looking at the switch from the left is like looking at it from the front of the headlight bucket. The upper side of te drawing is the left side, the bottom, the right side. The drawing shows it looking down at the top, and you're looking at it from the bottom side. The lefthand (front) switch contacts are for the ignition, the righthand (rear) contacts are for the lights. An old /2 design, it even has grounding contacts for the magneto...

Dang that's confusing.

Duane Ausherman has a page on this switch at his website, with photos.
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Old 04-29-2012, 03:32 PM   #6
Wdwrkr
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What ?? I think I followed that, but maybe I didn't, of course I could have, but there is a possibility I couldn't, then again I may understand what that said, but in the end I'm not sure I did... Think I'll have a drink and read it again

Pete
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Old 04-29-2012, 06:50 PM   #7
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Ha ha lol, hey Wdwrkr, what's that old saying, "great minds think alike." I guess I'm gonna have to hand trace every wire. I really didn't want to do that, but it is what it is!
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