I’m in a war with a buddy. I want to use this device to wire a horn to the trailer brake lights. I want to use the delay so it won’t immediately activate when he puts his truck in drive.  My question is the wiring setup? I order this but only received the module and nothing else. If I wire positive and neg to the module will that allow me to set the timer up, or do I need the wiring harness that apparently didn’t come with the module?