So installed the relay to the hammond box. To secure the relay i drilled into the main post on the bottom, then drilled a hole in the hammond box. To simulate a socket i used a water bottle cap that i drilled out till it fit snug against the contacts on the bottom of the relay. I screwed it to the top of the box using a washer and a couple of rubber washers .
Using a battery and holder i scavenged from an old desktop i wired this to the red led and led cover from a broken switch. The red led lights up with a toggle switch. Not the way its supposed to light up but its easier than opening up the trap itself and running wires again.