As noted in the comments, Flasher Load Resistors are wired in parallel to the led replacement lights, when using the original Flasher relay module. The flasher is probably a thermal one, and won't break because your led lights don't draw the current needed to heat it up to make it flash.
You should connect the load resistors between 31 the turn signal switch and Ground, one per turn line (Ch = Chocolate and Dg = Dark Green wires).
Hey, I just installed one resistor (after the relay) and the indicator light (from the tank), number 20 on the above electrical sketch it is turning on and off all the time, even if I cancel the left or right signal. I don't understand why. Everything works find beside that. Can't figure it out why is this happening. – user3672802 Apr 3 '17 at 12:48
This happens because 20, the turn signal indicator, is wired in parallel with the flasher relay. By connecting the load resistor between 32 and 31, to ground, you provide a path to ground for both 32 and 20. This path to ground is normally through the turn signal lamps. With the path to ground, you get this behavior because the relay turns on, starts conducting, gets hot, turns off, so the turn signal indicator 20 turns on. As the relay cools down, it closes again, shorting out the turn indicator, turning it back off.
So again, put the load resistor after 31.
Or as the other answer says, buy a new, electronic flasher relay that's designed to work with leds or incandescent lights, without the need to use load resistors. Using load resistors defeats half the benefit of led lights, which is using less power.
There is no test or all white function on the WS2812B leds. They require a specific timing signal on DIN (Data In) to show anything.
But simply hooking DIN to 5V should not damage them. Your description of a flash may be that they were damaged, or that you accidentally, by a fluke of timing, caused a level shift enough to make it think a real data signal came in.
You need a microcontroller with the appropriate code for the WS2812B protocol to see anything.
Best Answer
1: Yes, you can attach any number of LEDs (or pretty much anything else you like) to the relay, so long as you ensure that there is never more than 5A of current drawn through it. CAVEAT: The LED lights you linked didn't have a listed wattage or amperage. Without knowing how much power they draw, we can only guess as to whether or not the pair of them could take more than your relay's max 60W/5A.
2 & 3: Yes, and for vehicle wiring, soldering or crimp-on connectors are the preferred attachments as the vibrations can cause other connectors (like wire nuts) to work loose.
4: Yes, any wire rated for at least 5A/12V should be safe to use with that relay.
Image: Yep, that's how to do it.