just tried a led 501 in the blade and it wont light up, do i need a resistor. thought a sidelight wouldnt need one.
Not my subject, mate but I thought 501's were for vehicles with sophisticated CAN-bus control systems that ditributes data and power depending on the requirement. I would suppose without that, you'd need an inline resistor. But I am only spitballing and I'm no techie.