alright i read a tutorial on how to make one for cars and such and it said u need a 12V/30A relay... but i was thinkin why cant i just splice the power wire to the switch??

so i tried it and it works fine... but is this dangerous.. will it cuase damange if i dont use a relay?

 

It should work okay, but ideally you would want a relay...

 

but why is the relay needed/wanted?

https://honda-tech.com/zerothread?id=1374682 - if someone could explain to me how this works or if there is an easier method.. let me know