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Old 12-13-2004, 03:44 PM   #1
Malindi OP
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Joined: Jul 2001
Location: Vancouver, BC
Oddometer: 5,383
Motorrad Omega 400 problem

I mod a list for G/S bikes (monolevergs on Yahoo) and this question came in. I don't have an Omega, but maybe someone can e-mail Svante and/or post a diagnosis here?

Thanks,
K

Got the Omega 400W alternator with replacement diode board installed on
my '96 GS Basic, and has been very pleased with the performance for some
10K miles. But this autumn the charge indicator bulb began to
intermittently refuse to turn off, but stayed glowing partially even at
full revs. And finally never turned off completely. I thought it had to
do with my clock sometimes refusing to work, but after fixing the clock
(found a loose, tiny bulb inside the housing, intermittently
short-curcuiting the connection) the indicator bulb still stays on
partially glowing. Voltage is correct (have also checked with another
regulator installed). Regarding the diode plate I found the checking
procedure described in "Classic boxer charging" a little confusing.
Measure gives correct readings between AC input terminals and the D+
terminal, and also from all the G connections but there is no B+
assigned. I choosed the connector for the red wire to the starter engine
(B+ on the Thunderchild board) and then I get bad results, with big
resistance results in both directions for all the AC input terminals.
U = 3 vs 1,1 MOhms
V = 5 vs 1 MOhms
Y = 7,5 vs 0,8 MOhms
W = 15 vs 0,7 MOhms
This seems a little odd, are really all four diodes fried? Giving no
more noticeable sign then a glowing charging lamp?Or is there something
wrong with checking the board this way? Has anyone information about the
correct checking procedure and results for the Omega diode board? Of
course I will also appreciate information about any specific problems
noticed with the Omega charging set up so far.

Best regards

Svante Brandén, Stockholm, Sweden
mister-walker@bredband.net
R75/5 '73, LWB, black, "Devil"
K100RS '87, Motorsport, white, "Hero"
R100GS '96, Kalahari (mod Basic), white/blue, "Fraka"
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Old 12-13-2004, 04:20 PM   #2
Frank Warner
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Joined: Mar 2002
Location: Sydney, Australia
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Diode checking with a meter is dependant on the meter used. Some have a specific range for diodes, others you have to know what they do. Best to check a new diode - that should tell you what to expect when checking other diodes.

Larger diodes can have a some what different effect on the meter indications. If all the diodes on the board read the same I'd say they are ok.

The glowing light may simply be that the alternator side is at a higher voltage than the keyed ignition side - that is a voltage drop from the battery through probably a fuse, the ignition key, kill switch to the globe. You would need to do some voltage readings around the circuit to find the problem, not resistance readings. Measure the voltage on both sides of the globe - bet the alternator side is higher than the ignition switch side.
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