You only have turn signals? Whether turn signals or hazards you wouldnt want your work light blinking./w3tcompact/icons/frown.gif
To prevent accidentally leaving lights on and draining battery, you want to connect to switched hot wire behind dash, use test light to find.
If an aux. light was an option on tractor there might be a blank in your fuse block for that, if so fill it in with labeled size and find the new hot in bundle leading from block.