How to Wire a 12 Volt Relay?

A 12 volt relay is a line to load, You hook the 12 volt relay up to where you want you’re current to go to. You have a line going input and a load going output. Wire the ground wire first to prevent hazardous electrical shocks, and then you place the common and neutral wire to the line side of the transformer and continue on with two wires to the load side of a transformer.