So bought a 12V 30 amp relay for my horn. But I can't get it to work. Thought maybe it was the relay brought it back, got a new one; same results. So here's a few pictures, would love to know if I'm doing something wrong: Wire with the Red tape is fused going to the positive terminal of the battery. Closest wire, all black is grounded. Yellow wire going to the horn. Other horn wire is grounded. Skinny black wire in the back is connected to the horn switch. Checked all my wires, tested the horn and switch with multimeter, everything looks good. But it just won't work.