Axial LED controller putting out strange voltage. 15v wow

[madkawi650]

I am trouble shooting a problem with the front 2 LED lights on an SCX10. The tail lights work but the headlights don't. I took the controller out after inspecting all he wires for cuts.. All good. I pulled the little plug and tested for power and I get 15.2v holy crap!!! The tail light plug puts out 5v.. Here's the kicker. If I put the tail light plug in the head light 15v hole they work just fine, but the head lights still don't work..
Now I still may have a bad wire or LED on the headlights, but my mind boggling thing is the 15v output.. I'm only running a 2s lipo, how is this possible?



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[nocfed]

White led's have a higher forward voltage.
now my best guess on what would be easy to build from an electrical perspective is there is the led's in series and the led plug has a set current output.
so yes a 15v output would make sense, along with why your rear lights work.
chances are one of the connections for the led's is lose as led's rarely burn out.
so yes i would suggest you check the connections along the line.

As to the 15 volt... the simple answer is there is circuits you can make that will boost voltage.

[AreCee]

The voltage for the five string auxiliary lights is 18V. The rest are in the 5 to 6V range.

[madkawi650]

Found the led problem.. Wire broke inside the heat shrink at the LED.. As for the 15v... I had no idea it was supposed to be that high .. I thought an led had a range up to about 3.7 volts so 2 in series would require 7.4v. I built my own strings before.. I used 2 LEDs and a 62ohm resistor in each loop. Made four parallel loops. I accidentally hooked one up to a lipo without having the other hooked up and it let the smoke out of the one..


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