I didn't know LEDs were involved either. LEDs have a lot less current flow than a standard incandescent bulb. It may need a load resistor installed in the circuit to get a standard flasher unit to work. The electronic flasher units will flash at the rate they are designed regardless of the load. This might be the way to go but they are a bit more expensive than the signal stat type of flasher unit. At least it would work consistently that way. You need to find one that fits the flasher plug you have. Some are two prong and some are three prong types. Some are specifically for LEDs but it will have to work with 6-volts if that's what you currently have.
Here is a good link.
https://www.hotrod.com/articles/ligh...-flasher-leds/