Originally Posted by HKguy
I'm here because of the search function. I am installing the Dynatrac-Mopar F/R axles in my TJ which come with basically the factory JK locker. I am getting the factory plug and loom for the front and rear to connect up to the axle from there it's on me. What is the function of the relay in the diagram up top? I was planning a fused source for both lockers on the supply for the rockers. I am also using the Cotura II from OTRATTW for front and rear.
The purpose of the relay is so only a small amount of electricity flows through the switch, effectively isolating that part of the circuit. The switch causes the relay to close the circuit that feeds power to the locker. This electricity has more current that the circuit that the switch is wired to.
It works the same as any other circuit with a relay for anything else.
On a JK, the switch is wired into canbus system which means pressing the switch sends a request to the computer which will then send a signal for the relay to close and complete the circuit powering the locker. For DIY applications, this is not necessary and an ordinary switch wired the traditional way will work just fine.
I have never done it, but that is just basic electrical principles. That is what this forum is for. Sharing of knowledge freely in a community environment.