Back on an Airhead - 1975 BMW R90/6

[chasbmw]

What did you do with the wires that went to the under tank master cylinder?

[Horsehockey]

Originally Posted by tete

My headlight was has always been very dim on this machine. My other problem I am noticing is the blinkers are blinking rapidly, and the amber notification is not blinking at all. I believe this would indicate a short somewhere. I also notice that the brights used to work but not when I hit the switch the headlight turns off. Leaving me with nothing. This happen on the way to work tonight. Not good..

I'd start with removing and cleaning your two 8 amp fuses in the headlamp bucket. Clean the fuse ends, clean the clips that hold the fuses, replace the fuses and test.

[tete]

Originally Posted by chasbmw

What did you do with the wires that went to the under tank master cylinder?

When I got the bike It had the master cylinder relocated already.

also I notice I have no horn.

[chasbmw]

The Brown earth wire that used to go to the level warning light switch on the under tank MC needs to go to ground as it provides a ground path for (some of) the other warning lights in the speedo casing, if a remember correctly this also resulted in the indicators running strangely . It took me a long time to work this out when I fitted the handlebar M/C to my 90/6.

Otherwise indicators lights flashing fast are caused by poor wiring and earths to and from the indicators.

Hope this helps

Charles

[tete]

I can't seem to remove my head light as suggests in the clymer manual. Any suggestions? Here is a shot from underneath. According to clymer there should be a screw here underneath. Not on mine.

I do have one near the back of the bucket.

[Kai Ju]

Take said screwdriver, insert between the chrome ring and the housing at the six p'clock position and twist the screwdriver.
That should pop the chrome ring off.
Once it's off you'll see how it works.

[tete]

Thanks
It worked and unfortunately here is what was there.




It looks like the some thingy that goes on the right ( if looking directly into the bucket) for what ever reason was covered in plastic and tape. I dunno this looks like it will get interesting.

One thing to consider if commenting is that I have an acewell ready to install. But most important it is getting the instruments (headlight and tailights ) working good. Especially that super dim light. Which I suspect I'm using the parking light and my actual headlight is rubbish

[tete]

Ok so here are the problems to better elaborate.

1. Headlight is dim. The white switch is in the down position when it's on which I think suggest ima actually using the parking lights. When I put the switch in the middle or up position there is no lights



2. The blinkers work fine, however when blinking the tail/brake light flashes

That's the extent of my issues.

[tete]

I was trying to figure out where in the Clymers it shows what this cube shaped thingy is on the inside right of the headlight. is there a wiring harness I can buy that perhaps eliminated alot of this?

[SOLO LOBO]

Originally Posted by tete

I was trying to figure out where in the Clymers it shows what this cube shaped thingy is on the inside right of the headlight. is there a wiring harness I can buy that perhaps eliminated alot of this?

Bet the alu one on the right is the flasher relay

[chasbmw]

On the right is the headlight relay, the flasher relay is on the left. (as you look into the headlight).

Looking at the photos it looks as if the headlight relay does not have any contacts? What the bike needs is a new relay wired as per wiring diagram?

Charles

[Kai Ju]

Looking at the photos all the contacts are there, I think, but the relay portion is gone. You can see the contact plate wrapped in clear tape.
Get yourself a new relay and start over with info from here: http://www.bmwmotorcycletech.info/headlightrelay.htm

[craydds]

Originally Posted by chasbmw

The Brown earth wire that used to go to the level warning light switch on the under tank MC needs to go to ground as it provides a ground path for (some of) the other warning lights in the speedo casing, if a remember correctly this also resulted in the indicators running strangely . It took me a long time to work this out when I fitted the handlebar M/C to my 90/6.

Not to steal Tete's thread, but we are both installing an Acewell, so... Charles, as I look at the wiring schematics, I cannot see why the brown wire needs to be grounded to the frame. I don't doubt your actual experience, but I don't see the necessity of "re-grounding" the brown wire, as it appears that it already goes to ground (again, based on my interpretation the schematics).

[tete]

Does anyone have a daigram of the left switch / lights assembly. I believe I hve a bad switch.

[tete]

I'm trying to figure out how this might go together.
Is there a ball that goes at the end o that spring?