I first installed some incandescent indicators purposefully to not change the relay, but once installed they would not blink and would remain on. So i ended up installing an LED compatible relay to fix that issue. so i have incandescent indicators with an LED relay.Have you already converted to LED turn signals?
No resistor should be needed with LED compatible flasher relay..
Resistors increase the current/watt draw of LEDs which triggers bimetallic flasher relay operation..