Installing an Acewell speedo/computer on an airhead --

the blue wire from plug "b" (see Acewell diagram post #302) is the fuel wire; not needed so it was deleted. the gray wire is a nothing wire that went to nowhere so it was excised:

time to connect each wire:


ace red to bmw green/black, and so on, until all are connected:


say goodbye to the stock plug. sob.

Know YOUR bike's wiring. I like the BMW owner's manual schematic, seems to be the most accurate (see post #293 for a '75 R90S). Study bpeckm's wiring instructions! Read through this thread again, and again. Know your specific Acewell model wiring diagram. (see post #302 for a model 4454 diagram).

I bought a light to make a generator warning lamp; will connect this weekend. A few other connections to make, then it will be ready for testing and calibrations.

Thanks for the drawing. What size resistor did you use?

Chris, I have not completed this install, yet. I got the resistor idea from another thread; I'll try to find that again. They posted a link to Motorrad, http://www.motoelekt.com/charging.htm, who sold a resistor ready made to wire into place. Motorrad still lists the resistor, but it is part of their Omega charging kit; I don't see the resistor listed as a separately available item. I am going to call them.

Here is a link, http://www.motoelekt.com/genlightacc.htm , from sparymoto, post #4, in this thread http://www.advrider.com/forums/showthread.php?t=579875&highlight=generator+resistor .

I called Rick Jones at Motorrad and ordered the resistor.

Great information from everyone! Thanks! One thing I don't remember reading - if I WANT the "idiot" gen light, is there a specific kind/size filament bulb I need to buy? I might wire my 2853 up this weekend...

See post #324 above as an example. I think most types of warning lamps will work, but I think it should be an incandescent bulb, not an LED (I'll check with ignatz72).

Looking through ignatz72's thread, it seems that one should use an incandescent bulb for the generator warning lamp. Has anyone tried an LED?
Read post #119 by Bill Harris here http://www.advrider.com/forums/showthread.php?p=18097765&highlight=generator#post18097765

Snowbum says :Resistor discussion: Nearly any type of resistor may be used. It can be the old-fashioned type called 'carbon composition', or any modern type of 'film' or 'deposited carbon' type....or even a 'wire wound' type. The resistor value CAN be 470 ohms, but my tests indicate that 330 ohms is better.

from the same Snowbum article: The GEN lamp is rated at 12 volts and 3 watts. Ohms law says that the lamp resistance is 48 ohms when energized by 12 volts. I guess I'll poke around an autoparts store or radioshack...

EDIT: found this from Snowbum too about the Gen lamp:recommended 168 lamp = 4.90 watts, .35 ampere, rated 1500 hours, a.c.

Thanks!

Good info, thanks. I'll check the spec's on my little red lamp.

Tach cable has to go:


Gone:


Now, what do I do with the "hole" ? And the rubber grommet? Is there a solid rubber grommet - no hole for the cable?


Any ideas? What have my fellow inmates done?

I started hooking my Acewell 2853 up to my 1978 R80/7 today. it all went fairly well. My wire colors don't match what's been noted so far, but i think I've got it worked out.

My layout is:

Acewell--------------funtion----------------- BMW
orange-------------- turnsignal -------------new wire from signal
light green--------- high beam ------------ white
light blue -----------haz/Brake fluid -------blue/brown
purple--------------- nuetral ---------------- brown/black
gray -----------------oil pressure----------- brown/green
white ---------------- turn signal ----------- new wire from signal
black ----------------ground -----------------brown
brown --------------clock power -----------new wire to battery
red ------------------speedo ilumination---gray/black
blue --------------- fuel ---------------------- no match
yellow ------------- tach --------------------- black

left over bmw wires:
black/white - capped and using the new individual wires

blue
blue/green

I used the blue and blue/green as described in craydds' sketch below except i didn't wire into the acewell red, but the warning light I bought didn't come on... everything else appears to work though, so i'm wondering if i just got the wrong light.

no pictures of my rat nest, i'll just embarrass myself

I simply used some black silicone caulk to fill the hole in the rubber grommet... Later front-covers (after the electronic tachs came in ('+78?)) don't have the notch for the rubber grommet, if you would want to go that way....!

I also used some high-melting-point grease, like wheel-bearing grease, to plug the hole inside the front cover where the tach cable had been.....

Thanks, bpeckm! Good solution. I will order a new grommet, because the old one is splitting into pieces.

On my bike ('75 R90S) the grey/black is for instrument illumination, but is positive (+) only when the headlight is ON. That is why I used the BMW green/black connected to Acewell red; green/black is (+) when key is ON. On your bike ('78) the grey/black is (+) always when the key is ON ?
Good luck on your generator light. Test the lamp separately to make sure it lights up.

If you find one let me know. I don't think they sell those seperately any more.

part # 62-21-1-351-554, look here http://www.maxbmwmotorcycles.com/fiche/DiagramsMain.aspx?vid=51891&rnd=08102012 . I ordered one this morning.