indicators staying on not flashing ?

I have a Leyland daf horsebox 1999 plate, the indicators are staying on and not flashing I have been told its a relay I have been given the relay GFL13 but I m unsure where to find the relays inside the cab.
Daz, March 2017


done
Update: forgot this link:

http://www.fixya.com/cars/t9230183-leyland_daf

acp, March 2017
It rather depends on WHICH "Leyland Daf" you have but these links, gleaned from the same Google search you could have done, may help:

http://www.theoverlander.org/ovl-forum/24/7713.html

http://howtomendit.com/answers.php?id=396604

acp, March 2017
link Click here to see other fixes for Leyland.