Lighting issues please help!

CL77butcher · Post by **CL77butcher** » Fri Apr 22, 2011 8:15 pm

I just finished building the tail light and jerry-rigging a 35/35 halogen into the old housing for a headlight. I bench tested both and everything worked well. I got them installed on the bike and plugged in the same battery (known good). My LED tail light works properly but my headlight will not come on at all. I tried all switch positions at the key, hi/ lo beam switch, and at the headlight housing, no combination will turn on the headlight.
I disconnected the battery and broke out my multimeter I connected one lead to the center terminal of the rectifier and used the other to check the bullet connectors up front. I got continuity (diode check=beeeeeep) on every terminal. I considered the direction of current flow and swapped the meter leads, same result. I looked at the schematic and followed the SCR diagram, am I nuts or is that a good sign of a shorted SCR? I have never seen a diode circuit go bad as a short before I am used to a bad diode presenting an open. This is my first time playing with a SCR like the one on this bike though and wanted to check with the pro's.

Please let me know if I am going nuts or if this is just a 60's honda thing. I welcome any suggestions as to what is preventing my headlight from working.

CL77butcher · Post by **CL77butcher** » Fri Apr 22, 2011 9:23 pm

Ok so the SCR is not the problem. I am getting continuity through the new headlight. Still wondering why I'm not getting any light out of it though. Any ideas?

Eljeef · Post by **Eljeef** » Fri Apr 22, 2011 11:21 pm

Is your jerry-rigged light grounding well? I know my headlight bulb fooled me for awhile and it turned out to be tough to ground.

Eljeef · Post by **Eljeef** » Fri Apr 22, 2011 11:22 pm

Is your jerry-rigged light grounding well? I know my headlight bulb fooled me for awhile and it turned out to be tough to ground.

brewsky · Post by **brewsky** » Sat Apr 23, 2011 4:38 am

CL77butcher wrote:I have never seen a diode circuit go bad as a short before I am used to a bad diode presenting an open.

I have....here's what they look like:
Note there is no fuze between the hot battery terminal and the rectifier, so if it does short...it is not good!

Wilf · Post by **Wilf** » Sun Apr 24, 2011 9:23 am

That would be a Selenium Rectifier, not an SCR (Silicon Controlled Rectifier), which is an entirely different animal.

Wilf

brewsky · Post by **brewsky** » Sun Apr 24, 2011 10:08 am

Wilf wrote:That would be a Selenium Rectifier, not an SCR (Silicon Controlled Rectifier), which is an entirely different animal.

Wilf

Sorry about that...wasn't up on the SCR abbreviation...thought maybe it was "selenium controlled rectifier"

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Lighting issues please help!

Lighting issues please help!

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Re: Lighting issues please help!