KT-6S5-C Controller - Light output


New Member
I got this controller (KT-6S5-C 2018-1-8) recently and I'm a bit scared of plugging lights without some testing before.
There are two outputs from controller (on board these are brown and yellow wire) It seems the yellow wire only goes through a 51kΩ smd resistor.

My battery is 36v and just measured the lights with a multimeter on 200mA.
Front light is continuous 95.6mA, rear light has a stop function which doubles LED's so peaks at 19mA +/- and stays continuous on regular one led at 5.6 mA.

I'm trying to figure this out before connecting it and burning the circuit :D Can any one help figure out if this circuit can hold over 100mA at peak?
Would it be 100mA per output or for both?

posting pics of light pcb


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Well-Known Member
Good reason for concern is my understanding.

Why not build yourself an insurance policy with the installation of a relay? Then, all you have to worry about is the power to close it.


New Member
Thanks @AHicks
Yes, I'll have to find a solution.
Just got an answer from KT saying each light output max at 70mA. On my original controller thought of using a DC to DC converter to handle higher voltage lights with a manual switch.

The main reason why I got another controller was to be able to have lights on/off from display.

How would a relay be added to the mini pcb? To both positive outputs (white and brown) and negative from the controller board?

Wouldn't just soldering another similar resistor on top of the 510 increase current?
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Well-Known Member
I wouldn't try mounting a relay to the pcb. It really doesn't even need to be inside the controller case. I would use the switched light output wire from the controller to close the relay. Where you get the power to run the light (or DC-DC converter) would depend on what voltage you need/wanted.


Well-Known Member
Not much on electronics here, so no help. Electrical, fine. Electronics, just enough to be dangerous. Best of luck!


New Member
It worked!! Was able to run 106mA with an added resistor. Got a 100 Ohm 5W ceramic resistor and soldered it in parallel with the 510 SMD resistor. Resistance lowered to 33.4Ohms! And current increased. All done :) !