I'm trying to get the air horns that were wired directly to the battery (no fuse) and were switched on the dash , back to working with the horn switch on the indicator stalk.

There is no sign of the original horn wiring, only at the loom where the indicator connector joins the loom. So I was going to splice into this to make the horn push workable.

This is where it get's complicated as I don't know how to wire up a relay to the horns, to the horn push and get it working I've got a fused power source ready to connect to the relay but that's as far as I've got. I've tried all sorts of different combinations with the wiring but cannot get it to work, although it's clicked a few times.
I've also tried google for some input but that hasn't worked either

The relay I've purchased is a 5 pin mini relay (normally open circuit)

Terminal code - 30 input, 85 ground, 86 switch input, 87 output contacts (x2)

Can anybody tell me what wire should go where please ????

It's my MG not a land rover, although the wiring is probably the same on both