Hi, currently trying to debug the headlight function on my MC28. The bike had been disassembled. I have the workshop manual but it is not very clear on what should happen in the various modes so before taken anything apart again I would like to know how it should be so I understand the principles first. N.B. I have this bike new so I cannot tell how it was before I took it apart.

1. I understand that the headlight is supposed to be off if you insert the memory card and have not started the engine yet. Correct?
2. The taillight should be on directly after inserting the memory card. Correct?
3. Before starting the bike and with the memory card inserted, switching to high beam or pressing the pass switch has no effect. Correct?
4. When the engine is started, the headlights "automatically" turn on. Correct?
5. When the engine is stopped e.g. per kill switch (NOT by removal of memory card), the headlights stay on. Correct?

Thanks for any input.
gepe

ok, found out by myself by studying the wiring diagram.

1. When inserting the memory card, only the taillight turns on. Neither low nor high beam are on.
2. As soon as the engine makes a few revolutions (either by starting it or just kicking it), the headlights get turned on.
3. The lights stay on even when the engine stalls or gets turned of per kill switch until you pull the memory card.

This is due to a "self-holding" circuit; when the alternator delivers a few sine waves those make the headlights relay to close the contacts and these closed contacts then feed the voltage to the relay's activator coil (even if the voltage from the alternator drops) until voltage is cut off per memory card
.
My "problem" was that the low beam filaments in both! lamps were gone (already when I bought it) but after messing with the bike for a few months I was sure it was due to my lack of skills instead of checking both lamps.
Well, lesson learnt.

LOL

Don't you hate it when you overlook something "simple"?! I'm sure we've all done it!

The worst case I've encountered was a seized motor! The guy said "the oil light never came on, so I kept riding..."! True story!
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Andy.
NSR-WORLD.COM

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