Thread: LED Issues
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Old 03-06-2019, 12:02 PM
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Do Lee Do Lee is offline
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Join Date: Feb 2003
Location: Victoria, Texas
Posts: 253
Thumbs up LED Issues

It's been several years since I've logged on the sight, I'm back into riding again.

This is what I encountered when I converted my 79SF to LED lighting.

Scott,
If you have a 79 Special and your using the stock pilot box the problem is at the turn signal indicator light. The left turn signal (brown wire) goes into the socket and the right turn signal (dark green wire) is attached to the outer part of the socket (shell). So the left and right turn signal circuits are linked at this point. The incandescent bulbs don't care which way the voltage flows as long as it goes to ground. The LED with little resistance sees the voltage coming and lights all the turn signals. I can't remember how the lights work when the left or right signal switch is turned on but one would flash the instrument indicator and the other would turn the instrument indicator on dim. The 79 XS Special was the only year model to have the turn signal indicator as a single light in the instrument pilot box. To make the 79 Special turn signals to work properly you will have to change out your instrument pilot box with a 1980 or 1981 Special or any Standard instrument pilot box (with indivual lights for the left and right turn signal indicators) and rewire the plug to work on your bike.
I went through the same problems a couple years ago.

I hope this helps.

I forgot to say that I used a standard pilot box and I'm just using the turn signal indication lights.
I also tried to use LED's for all my instrument lights and found out that the high beam warning light would stay on all the time with an LED. I guess this circuit has a small amount of current flow to light the incandescent bulb (very dim) for bulb burn out. All others worked fine.
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