no low beam

[reddevilmedic]

i have no low beam. it worked, very dimly, for a short period...maybe a couple weeks. started it this morning and no low, high beam works but shows a draw on gauges. bulb is about a month old. any ideas?

[bongobobny]

Corroded connector on the bulb??? Bad reserve lighting module???

[reddevilmedic]

i will check the connection, but, i just put a new bulb in and it looked ok. where is the reserve lighting device?

[Flyinfool]

More common is dirty contacts in the hi-lo switch on the handlebars.

There is a thread here somewhere on how to clean the switch.

 

I have also seen bad brand new bulbs.

[bongobobny]

The reserve lighting box is on your front fairing frame on top in the center above the relays but behind them...

[bongobobny]

Yes, also what Jeff said too!!!

[Condor]

My '83 had the same problem, and I planed on resoldering the CMU, but I picked up a mint dash and swapped the whole dash out. Everything worked great afterwards.... I'm positive the CMU needed to be fixed. The link above is off the other Venture board.

http://www.venturers.org/Tech_Library/index.php?action=article&cat_id=001007&id=249

Edited September 17, 2012 by Condor

[icebrrg3rd]

+1 on the CMU. I re-soldered mine when I first got the bike to eliminate some warning lights on the dash and a dim/non-op low beam, then did it again recently because of the dim low beam. Back to full strength low beam now.

 

-Andrew

[reddevilmedic]

where on the cmu is it?

[Condor]

Follow the link I just posted..... OK for some reason the link doesn't work as advertised... It will take you to the main tech board. Do a search for CMS... their CMU... and it should come up.

[reddevilmedic]

i found it. there was a break on the board. you can see it just below the jumper. since i have limited soldering skills, i just jumpered between those 2 points...voila! low beam! thanks for the help!!

Edited September 17, 2012 by reddevilmedic

[Condor]

i found it. there was a break on the board. you can see it just below the jumper. since i have limited soldering skills, i just jumpered between those 2 points...voila! low beam! thanks for the help!!

 

[jeff1]

Maybe that is what is wrong with mine, the head light will go out for a split second then come back on. Does anyone know what the reserve lighting unit actually does?

[Condor]

Maybe that is what is wrong with mine, the head light will go out for a split second then come back on. Does anyone know what the reserve lighting unit actually does?

 

It monitors the lighting. In the case of the head light it lets the rider know that the head light needs replacing and switches over to another circut for the high beam. That's if there are no cold solder joints in the CMU, which is generally the case in 99.9% on the time. Just like the CLASS system board. The bikes get old and aren't going to last forever without maintenence... Just like us... Vibration and age will take a toll....

[bongobobny]

Looks like a professional repair to me!! Thye other way to fix a crack like that is to strip off the green paint mask on both sides of the crack and then solder on a single jumper wire like from a resistor lead, etc and then paint over it with nail polish or something similar...