rear led indicators in mtkt undertray

ive just fitted a motorkit undertray with the built in brake light and indicators, the brake light works fine, but the indicators just stay on they dont flash, so i need a new flasher relay but the only ones ive seen are 3 pin and mine is 4 pin, so does anyone know who sells 4 pin relay? or does anyone know another way to get around this?

thanks

 

i dont mind if i have to spend a few quid as long as it isnt a fortune, would the resistors make the bulbs flash again?

cheers

 

thanks for the info, so will i need 20amp resistors? sorry for the questions im not really an electrical person lol

thanks